This is a perfectly valid opinion to make, but I think everyone doing so should disclose where they work.
Additionally, I would hope they apply the same scrutiny to all companies that are harmful or don’t provide value; for me, that would include (non-exhaustive list): tobacco, alcohol, soda, fast food, junk food, high-frequency trading, gambling, and any company that is currently not or does not have an actionable plan to become carbon neutral, and that’s just off the top of my head.
Or we could just let people (and by extension advertisers) decide for themselves.