They're deleting the `sh` binary and symlinking it to another binary, with zero detection of what that binary was (or was pointing to) before deletion, or what the user may have configured their system to do.

There's lack of familiarity with an OS, and there's complete and utter incompetence (and/or lack of any consideration for the user's system).

Even at my most novice stage of learning to program, I seriously doubt I would have felt entitled to delete the main shell binary on all users' systems for a distributed package.