browsing through All has so much pro-fascist posts coming from lemmygrad that it drowns out all the other instances. I'm surprised they're even federated by default but we should have an option to block instances from All if lemmy is deadset on federating with them just because they are fascists with a red and yellow flag...
(before the Tankies start posting about how they aren't pro-fascism "Fascism is a far-right, authoritarian, ultranationalist political ideology and movement, characterized by a dictatorial leader, centralized autocracy, militarism, forcible suppression of opposition, belief in a natural social hierarchy, subordination of individual interests for the good of the nation and race, and strong regimentation of society and the economy" which all describe the Z movement in Russia they gleefully support in multiple posts)
This is called moderation... It's basically the same thing as deleting individual comments that don't fit the rules.
I'm not saying there shouldn't be any moderation. But there's a difference between deleting a post and preventing whole communities to be accessed because of a subjective sense of what is the correct viewpoint on [topic], be it political, ideological or else.
I could imagine a setting where other instances' posts/communities aren't shown on the All page, but could still be subscribed / viewed by the user if he requests it.
how should admins deal with malicious servers? Like some that post illegal stuff or whatever.
This is indeed a difficult problem. Especially as laws and their interpretation are highly dependent on the hosting location.
Hiding posts behind warnings or only showing them only on user request are on the top of my head.
That's not a solution for illegal content.