Most actors really love it, that's what they want to do. They burn to do it. And so they'll read a script and think, that's an interesting part. And because they love acting, that blinds them to the fact that the rest of it is pretentious nonsense, which it very often is.
When a child can be brought to tears and not from fear of punishment but from repentance he needs no chastisement. When the tears begin to flow from the grief of their conduct you can be sure there is an angel nestling in their heart.