In the X-Men Comic Cable and Deadpool (2004-2008) Cable makes a a proactive effort to improve things, attempts to create a little utopia. While it all goes pear shaped, I got the impression that was mostly for editorial reasons (actually I only got interested in the series after the cross-over in question de-railed things).

Haven't re-read it recently, but it got me asking questions at the time about whether a superhero with knowledge of the future could actually make things better.