Life is politics. Death is the only escape.

The first image is innocuous, not overtly political if overtly off topic. Off topic discussions happen.

The second, well you're browsing a community on a "politics" instance. There are communities there and people who aren't devoted to it. Unfortunately the administration is. And it ultimately seeps into everything. If its an issue for you (it is for many many people. No shame there) BLOCK it.

The only real answer when it comes to niche communities and activity. Is to be the change that you want to see. Take an interest or two of yours that you feel is unrepresented and start a community. Try to post content there as regularly as you can. And then as you go along. Browsing new posts. When you see other posts in communities you might be interested in. Simply take the time to stop in and leave a post of general encouragement. It can mean a lot to those who post and moderate. And encourages others to do the same. Realistically the fediverse isn't all that different in many ways than early Reddit. And that is how it grew.