At least, for the 'leftism' in the sense of being sympathetic to minorities and open-minded about social change of various kinds. As an actor, 'put yourself in someone else's shoes' is basically your day job - if you manage to escape getting typecasted too much, you're expected during your career to act in a variety of roles, a variety of characters who all have different backgrounds and opinions. Of course you can do all that and still have so-called 'conservative' views on other topics such as the economy, but a certain level of open-mindedness and empathy for the poor is rather natural in actors, I'd say.

Is it? How many cases do you know in American sports of people who play well for a season or two, get an extremely lucrative contract, and then fade into insignificance while still getting paid the same until the contract runs out? In Hollywood that's a lot harder to do.