I didn't mean that more exit nodes should collect and share their logs. That would indeed weaken the Tor network, by facilitating traffic correlation. I meant

I didn't mean that more exit nodes should collect and share their logs. That would indeed weaken the Tor network, by facilitating traffic correlation. I meant inspecting/manipulating the traffic if it is unencrypted. As a political statement, this should of course never actually attack the client, but instead try to raise attention by e.g. injecting a message along the lines: Hi, I'm a stranger and it was trivial for me to inject this message. Please use HTTPS to prevent me from doing this. Thinking more about that, however, this may be a bad idea. People could perceive this to be a security hole in the Tor network itself, rather than HTTP itself, which could damage the reputation of Tor.