Actors get pigeonholed very quickly, particularly movie actors. In the theater, one is more used to casting people against type and trusting that their talent and skill will get them through. ↗
The interesting part of the process is developing the character, you know, why did he become that? Why is the guy a murderer, or why is this guy a pervert, or whatever he is. So that's the fun part for me to delve into the abyss. ↗