I wouldn't dare. I couldn't purposley torture someone, force someone to do something against their own will, or kill someone. I've never thought about using them on anyone either, seeing as I don't hate anyone enough (or at all) to use them.
I personally would use the imperius curse on someone if they were hurting themselves or others like stop them from doing bad things, like stop them from committing suicide or even shooting people like the shooting at that school that killed 20 students and 6 teachers.
I agree with you except on stopping someone from commiting. Imagine you had a really bad injury and a couple of pain pills right beside you but you couldn't move your hands to reach them. It would be awful. That's how the person would probably feel.