Exploding heads was a Libertarian conservative instance. Free speech. There were still obvious rules like no calls for violence,  doxing,  and death threat ect.

Most instances defederated us because EH allowed offensive Memes, conservative news, and posting our opinions. They didn't like that. 

They constantly called us Nazi extremists, bigots,  racists and so forth just because we don’t believe their ideology. 

They didn't like the fact that we were not getting banned for speaking our minds. So they would defederate to isolate us. As punishment for wrong think.