I can't tell why people in general like Thrillers, but since thrillers in general are my favorite genre of movie. I can tell you why I do.
They are just fun to watch.
Tension which causes your heart to quicken and you become more alert.
Can you tell me one of your favorite thriller movies?
Shutter Island
this film is a masterpiece
Unexpected ending, brilliant acting.
Often (not always) they have complex story lines and can be challenging to follow, so as a viewer you are always guessing what is going to happen next.
Such a dramatic movie it made me cry.
this film is a masterpiece
Often thrillers are about subject matters the average person would never experience so that is or can be exciting to watch
there is maybe a point that some people don't like to be scared
Action, suspense, anxiety, drama all of these things are hard to turn away from.
So thrillers excite you, horror scare you, romance moves you.
Being able to experience danger without actually being in danger.
You come out feeling moved and like you have had an experience