Inconsistencies in Sim Decisions Based On traits and Likes/Dislikes

I feel that I have to babysit my sims in public gatherings because they'll either cheat on their spouse (Even if they have the loyalty trait) just because they're flirty, or they'll offend someone by using mischief even if they dislike mischief. I I had one instant where just because my sims were flirty they cheated on their spouses ( my sim flirted with her sisters husband) and they started a love bar even though the husband had the loyalty trait. It would make more sense if the loyalty trait meant that all aspects of romantic actions were rejected if they wren't the sims partner. I even had instances were loyal sims would cheat (Without me supervising) and since the trait makes them feel bad when that happens they'd apologize and it seemed everything was fine. And then they'd cheated again just because they were flirty and were friends with the person. It's made me no longer use the romantic trait because it always just ends like this too. Mischief is something that I often put as a dislike for my sims because good sims don't like it or are tense about it or it makes it hard to form friendships or relationships. Well when it comes to other dislikes sims will be tense when a color is a way or their least favorite song is playing and or being force to do an activity they don't like, but not when they use mischief they get tense when someone uses it on them but actively troll forums or prank people. So In conclusion I'm really tired of trying to do traits or dislikes to avoid situations just for them to not work in effectiveness.