I share the general disappointment but to steelman a positive outlook: People in power have always done horrible things and orgs like wikileaks and some from the media counterbalance this. While this was a tragedy, if not for such a strong light being shined on Assange, he surely would've disappeared. At least he is getting freedom now, at least he exposed many important things with his organization and at least he inspired many people to do similar things.
It's true I've never really felt worse about the future. Maybe because I was blissfully ignorant, or maybe because things are actually worse. I try (and struggle) to stay positive because it is so easy to be cynical and detractive and I think that ultimately makes things worse for the world AND my own mental health.