You would be surprised how many genuinely amazing pieces of software you use / rely on on a daily basis the developers of which you don’t politically align with.

I agree that separating the artist from their art is not (always) easy, or even possible. However, in the case of Lemmy you can actually separate yourself from the influence of the creators (for example by defedarating from any instance they have control over), in the worst case scenario, where even the software itself would include these kind of biases, parts of the community could literally fork the codebase and remove all the problematic parts.