The entire point of sites like reddit, and even more lemmy, is that there are different communities with different purposes and views…
If you can’t handle a variety of different political opinions, don’t participate in them…
We can’t block them and they commingle with communities we do want to see. It’s impossible not to participate when it’s absolutely everywhere. My first thought when I came to Lemmy was “Wow, this is a better reddit.” An hour later? “Wow, this is just a tankie site.”
We can’t block them
Of course you can block them, you can block anyone you want… You can only choose to get content from communities you are subscribing to… You can choose to only get local content… And if you want, you can even create your own Lemmy instance, only allow people you want, block any other instance you want and only browse locally…
It’s as if you browse reddit/r/all and then complain that you get the content from subs you don’t want…