Slight spoiler: nah even though the magic was intensifying their feelings of affection they still chose to do those things, the magic amplified their feelings of affection nothing more.
They explained that the magic increased their affection towards Pina, which of course would make her more credible in their eyes, but it wouldn’t have been possible for them to hurt Remi that bad unless they had willfully ignored everything they knew about her and failed to investigate at all. It’s 50% the potion, 50% their own failures. If they had truly been loyal, trusting friends to her, even after consuming the potion they still would have given the benefit of the doubt and investigated properly
Honestly, I feel bad for the prince and anyone who was friends with Remi before this. They were hypnotized, which not only destroyed their relationships but also ruined their reputations.