Sigh, stay of the ganja man, you're hallucinating, I've never said that the guys forged any evidence, Pina forged a whole lot of evidence, tricked witnesses, staged events and spread rumours and the manga doesn't even hint at the guys knowing that the evidence, witnesses and events are falsified (the manga supports this).
I'm not bothering to respond to the rest since I've covered it multiple times and/or your interpretation of characters and events in the manga is tainted by your foreknowledge from other sources since it differs from the manga.
I agree with you that people are downplaying how much a potion that makes you regard someone favorably even if they'd normally annoy the shit out of you can be.
However, I think you're missing that the potion is simply "make them like Pina more," not "force them to be assholes to others."
For example, if Pina tells them to stab a puppy to death, there's nothing compelling them other than..feeling slighty bad if Pina throws a tantrum that they didn't immediately stab a puppy to death. Seriously irl if someone I cared about told me to do something awful my response would be "uh bad joke," and then "...are you okay, is your blood sugar low? wtf no I'm not doing that come on, lets make sure you got your meds" versus "YES I WILL INDULGE IN ATROCITIES AT YOUR COMMAND MY LOVE"
While they might have abnormally high tolerance for Pina, it doesn't mean they were forced into a scheme to ruin Remilla's life via public humiliation (keep in mind if it weren't for OG Remilla taking over, Emi's whole life and future would've been ripped to shreds at story start). Seriously, it's possible to like two people who don't like each other without deciding to nuke the life of one of them, see any story ever about people caught between spouse and in-laws.
To further the analogy, lets say you have a Ride or Die Bestie and the Love of Your Life. Unfortunately they hate each other, and despite your attempts to mediate, communicate etc you're told its time to pick one or the other. You decide you gotta stick with Bestie and thus break up with the Love (now ex). When you do this do you:
A: Message them you two need to talk, go somewhere private and regretfully tell them this isn't going to work out and you hope they go forward in life as a better person (since here you've started to belive Bestie's claims this person might be a bit of an asshole)
or
B: Decide to pretend everything is alright for months, until ex-Love's college graduation where they're giving the valedictorian speech is happening, steal the mic from them to scream about how they're the worst person ever and hijack the projector to show photoshopped images of them murdering puppies and kittens? Oh you also decided to email these to all the grad schools/employers they applied to in an active effort to ruin ALL their future prospects?
I don't blame OGMLs for being overly tolerant of Pina. I blame them for being assholes to people who aren't Pina--mainly Emi!Remilla here. Liking someone isn't an excuse to be cruel to others even if the person you like asks you pretty please to be an asshole.