What influences you more in situations, logic or emotions?

What steers you, logic or emotion? Would you react to something you logically should not be effected by or would you be effected by it because in spite of what the logic shows it is something you just don’t personally care for?

An example to get your mind working, if you have a friend maybe rather close and you discover that he/she was arrested some time ago for being on a radical group that planned to blow up schools. The whole time you have known them they have been model citizens and helpful to most they meet; people in general like them a lot. Do you go by what you know of then and how they act in the present or allow what they were arrested for years and years back effect your relationship with them?