One, you can't keep politics out of code. Code, like sports, like games, like movies, etc. is inherently political. Who has access to software? Who doesn't? Who is in the training set? Who isn't? Who gets the education necessary to write code? Who doesn't?
But I agree, you should target these improvements to open source tools you use, care about, or are a contributor to. It's ok to have a bot assist in writing the PR, but you should deploy it narrowly.
My personal experience with most of these bots is, most of them are promoting some kind of service (image/badge bots) or try to enforce a certain behavior onto maintainers ("Your are missing a [code of conduct]"). Haven't yet come across anything useful.
If your political issue is something you truly care about, please at least make the effort hand craft your pull-request. And even then, it would be awesome to keep politics out of code.