(I don't need a hobby, I like using my time to vote with my dollars.)
Guardian might've made your windows (car & home); Invista might've made the nylon in your clothes; Molex makes the liiiiiiitle tiny bits of plastic in the computer you're using.
Live pretty much anywhere except the coasts in the US? Koch probably sold the softwood lumber used to build your house.
You sure your car doesn't burn gasoline from Flint Hills?
Do you ever use paper products? Georgia Pacific (Brawny, Dixie, Angel Soft...).
They're so foundational in so many basic industries, they're just unavoidable.
Let's just say, I try my hardest.
Plus, most of these companies are in B2B commodities industries where purchasing is the margin driver, not sales. So I wouldn't worry too much about whether the Nylon 6,6 in your yoga pants was made in an Invista facility... your purchasing decision just wouldn't matter that much.
Personal choice is what I have here. I am fighting with the tools I have at my disposal. It might make some feel better to say my personal choice is useless. Let's assume that's true. Given that I choose to think that even smallest person can make a difference. I also choose to think that it's cop out to say otherwise.