You all raise some good points. This discussion about cheating seems to miss a few important points.
1. If you read, "Republicans Claim Voter Fraud. How Would That Work?" You'd realize it's too hard for either candidate to cheat by submitting enough fraudulent votes to swing the election. Cheating through poll workers would be hard too, because reps for both parties are watching them count and scrutinizing their tallies in real time. It's pretty hard to hide voter fraud and it's easy to catch perpetrators (like that GOP group in 2018 that was "helping" people by filling in and submitting their ballots). Add to that the criminal consequences for actually committing voter fraud, and it's not just wrong, it's stupid.
2. Unlike what this manga presents, Trump has not been chill. He's declaring victory without a majority of votes, saying votes he disapproves of are illegal and fraudulent, and trying to move the contest to the courts (that he's stacked with GOP judges). Still, judges have thrown out most of his challenges because they lack evidence of fraud capable of shifting the election. At best they present a few potential examples, when it would take (today) discovering >20k fraudulent votes to shift Wis., Ariz., Pa., or Nev. into Trump's column. It would take discovering about 150k for Trump to reverse Biden't lead in Mich. Even in Ga., he would need to discover almost 10k to reverse Biden's lead. That's a lot more fraud than they have evidence to prove. The only successful challenge I've heard of so far let his poll watchers get closer to poll workers in Pa. (6 ft away instead of 15ft away).
3. Besides being difficult and potentially sending you to prison, there are moral and ethical problems. On the moral side, if you are voting, you are expressing faith in a system that decides representatives based on each person getting an equal say. While that system is not actually equal in terms of federal or state representation (the Senate and electoral college mean each CA voter counts less than each WY voter, and GOP gerrymandering means a majority of Dem voters hold a minority of legislative seats in several states), submitting fraudulent ballots dilutes your neighbors' voices. It's a betrayal of your [church,] community, country, and your own right to vote. Attacking polling places or poll workers counting votes does the same. That's not patriotic. As
@dsfargeg suggested, it undermines the security and trust that we all rely upon.
4. On the ethical end, you might refer to Kant (as
@Tamerlane did discussing a categorical imperative) and wonder, if everyone cheated, would the world be a better place? If everyone committed voter fraud, it would be victory by the best counterfeit. The person who submitted the most fakes without getting caught would win. If those were the real terms, politicians would have strong incentives to serve the best counterfeits, who would probably be rich. If anyone discovered this fraud, it would undermine everyone's faith in voting, preventing America from being a democratic republic.
Why should we vote if our votes don't count? If all the politicians ignore me, my vote can't make a difference even if poll workers count it. If voting is a scam, why hold competitive elections? Why not let our leader serve for life (DPRK/Saudi Arabia/Iran/Syria/China/Russia style)? If those scenarios don't sound better than ours, then we have good reason to avoid cheating as an ethical matter. And if you want to improve the system to make it more fair, you probably need to follow the rules so your voice can make a difference (if you don't respect anyone else, why should they respect you?). This is like what
@dsfargeg offered, but, as
@Denrick19 wrote, I don't think you have to resort to violence to present the value of reciprocity. Reciprocity has value, even if society doesn't wholly revert to a violent, Hobbesian state of nature as a result of a little cheating.
5. If you don't care about the consequences or moral/ethical problems, cheating might still look alright until you remember, getting any benefit (in your case, submitting thousands of votes against Trump and GOP senators) means you'll probably get caught, erasing the benefit of your fraud and sending you to jail. That would also make your allies look like crooks, hurting your efforts to achieve those ends you like.
That's probably why Dems instead focus on encouraging people to vote, like that Rural Utah group that drove through the Navajo Nation, offering free tacos and helping people without formal addresses use Google location codes to request ballots and vote. The GOP focuses on mobilizing Republicans and making voting harder for others to do (e.g. Gov Abbot in Tx only allowing one vote drop box in each county, even though Harris County, full of Dems, has 4 million residents). Dems: If enough people vote, broad coalitions can enact popular policies. GOP: If voting is hard enough, you might be able to disqualify enough voters (e.g. Ga. 2018) or throw away enough votes to help your large minority rule (what Bush did in Fla. in 2000 and Trump's trying to do in Pa. 2020). We'll see which strategy decides this election.