I'll paraphrase a statement I made on IRC a moment ago:
You can break a system with slackroll, with swaret, with slapt-get, with slackpkg, and yes, even doing it "by hand" or "manually" or whatever you want to call it. In all but a small minority of cases, the tool is not to blame - it's user error, even if that error was failing to read and/or understand the documentation on how to use the tool properly.
Ultimately, shit will happen. It also happens to fly farther when using tools.