Why is everybody in the council an idiot... is it like a recruitment pre-requisite or something?
Actually, it works to his advantage. Their hatred of him means they're liable to underestimate him. Remember he's smart enough NOT to use his ability. Also Eyebrows acted because she assumed Haruto was planning a rebellion (remember, by DEFAULT they all think the worse of him that they JUSTIFY taking away his "human rights" like he's an animal that will do evil the SECOND he thinks he can get away with it! Of course WE know Haruto wasn't thinking what she was thinking, but they can't read minds, thankfully that ability is with the other girl NOT apart of their circle)
but it's up in the air on just how much they know about his powers other then they think it doesn't exist (remember only a SMALL few even KNOW Ghosts exist, so his ability comes off as a "dud" and even then they don't know about the bracelet which is his trump card. Her "plan" relies on Haruto being "the foolish weakling they all believe him to be" plus Power does go to ones head if one doesn't learn to not let it do so! Their teenagers and have all that power as the Student Council, you can guess how badly that power can be ABUSED! She thinks SHE has him outwitted, but instead HE has the advantage!).
Haruto on the other hand has likely DONE his research on the notiable ones, namely the ones he unfortunately interacts with (unfortunate as you KNOW their default ESPECIALLY Glasses Default viewpoint on him) he also has the advantage of his ghosts which they don't believe exist, and his "partners" (AKA Bomb Girl) can see and interact do to her "experience" so basically they have an UNFAIR advantage. (though saying that is LAUGHABLE when you remember what Eyebrows plan is). We've yet to see THEIR (Haruto's) side or their plan for the event. Haruto has gotten smarter in how he does his plans (his early plans were based on luck and catching his opponent off guard, Bomb Girl was SUPER LUCK as remember he LOST to her, a mix of her crush on him and as she saw "finally getting to play with him more intimidately under the excuse of "punishment for defiance" was the ONLY reason he got to do her and get her possessed, same with the other girl that was a CLUTCH victory as well. The thing with the two kidnappers was a sign he's starting to get BETTER at protecting himself and as shown with Glasses in the last chapter, he's smart to NOT use his new ability in front of her....even though he knew the Tomboy was going to beat his ass in, which thanks to Bomb Girl who might as well be the FL, that didn't happen. This chapter at the start with his sister was likely to scare the SHIT out of us as we got to SEE how TWO of her abilities worked, and you can TELL she was "thinking of Haruto" as she did what she did to that criminal. Still a mystery on WHY she's obsessed with killing him. But as we see with the SC, their COMFORTABLE with BADLY harming Haruto as long as he isn't DEAD, but how eyebrows described "accidents happening" it may have been directed at "those on his team" as their goal is to ISOLATE Haruto, it's why the second girl was attacked after all, and why eyebrows plan was to use the win to ORDER Haruto to stay away from the other girl. A two for one, as it leads to Haruto being COMPLETELY isolated like before! Though why she panicked is still a mystery, it does seem like Haruto DOES have a means to fight back if she was SCARED of him making contact with the girl who tried to kidnap him. Just not aware of it YET or at all because he's still on the hunt for girls to get on his side.......and his win will likely go into that. He's not stupid because Tomboy ALSO dropped the ball in telling him they're 100% out to get him. He knew as his sister's subordunates they hated him as much as his sister did. But to the level of THIS means he KNOWS they won't play fair!)
As they say "Never stop your enemies when their defeating themselves!" Their arrogance is HIS Hope