I don’t agree with the “don’t bother” hopelessness in this thread. Trying to do the least bad thing is still worthwhile, even if you can’t do something perfectly ethical. I’m proud of you for doing your best.

Yup. Don’t let others choose your ethical views and decisions for you. I know boycotting big companies makes life more complicated (and sometimes more expensive) but I’m still doing it myself.
If you don’t want to support a cause because of whatever, go for it and look for an alternative. Enough asking around and studying the Internet should bring out more options eventually, if you got the resources for this study.