I've never actually tried this but feel like rm should have a built in warning specifically for that command letting them know they've been trolled and have a y/N prompt.
I think that is only if you pass /, I don't think the flag is required for /* which is what is shown here - if I remember right, it's because the * triggers the shell to expand the paths and that flag is only built to protect / (from say, having an empty variable alongside /).
Come on, it is super fun. Just install VirtualBox and set up a virtual machine, make sure there is no funky mount point that touches your host machine, and go nuke that VM !