How to get my players to hate the BBEG

This could also be put under world building. Starting a new campaign. Done mostly the pre written ones, but gotten into making them myself the past year. Usually I just have my BBEG kill someone the PCs held close, banished them, brought them up on crimes they didn’t commit if it’s a king, etc. how can I motivate my players to want to go after this person, without outright saying “this is bad guy, go stop him”