I didn't noticed that there are other problems with this script. So maybe it needs a complete rewrite instead.
But I doubt if it should be simply deleted. Actually I think there is a litte problem with the installer: "add Python to PATH" is not selected by default when installing. I don't know if there's a reason for this. But beginners like me tend to install Python under the default configs therefore it is possible that they later find Python is not in the system PATH. Under this condition it is at least more convenient than manually setting the env vars.