[mschuster91]

> But isn't it somewhat reasonable that I push someone else's commit? Say I want to rewrite an old commit, and then force push that, then all the commits after the rewritten commit by other people would effectively be pushed by me.

Even worse: rebasing (what rewriting an old commit actually does) changes all SHA hashes of the following commits, thus breaking existing PGP signatures on the commits. There should be two signatures... one for the patch+comment, one for the history.