Don't Pipe to your Shell
What's the difference between piping to a shell and running a random executable or installing a random ppa?   All 3 could do massive harm to your system.<p>One difference is that piping to a shell is a lot easier to inspect.   So you could easily argue that piping to a shell is safer.<p>Heck, even downloading a source tarball and compiling it yourself isn't any safer unless you actually inspect that source.   And who does that?