A few years ago we introduced svn in our company, to replace PVCS. After 4 years, we managed to hunt most of our source code down and get it commited somewhere. Now, we have loads of contractors, some good, some bad, most cheap, and almost nobody longer than a few months. After seeing what insane things some of these guys managed to do in subversion, I simply don't dare introducing git: The history rewriting features like rebase in their hands scare the hell out of me. At least with subversion, i know that what's in there stays in there. git is great if you can trust your people, but svn is a better choice in a large political company that does not care about what happens to its code.

And dont get me started on the abuse of backups or build systems.