I think end to end encryption should be the minimum requirement for any private / direct messaging in any chat application. Group chats and larger I don't think it's as necessary since the guarantee that the conversations will be leaked is much higher, just reasonable encryption for those is fine. I do think its entirely possible to have a conversation that sounds incriminating out of context, and in fact is not even remotely relevant. If my shitposting conversations from my teens were taken out of context and shown in a court room I'd be facing several life sentences in an asylum.