In the Hooniversity, they witness a beanbean person transform into a Laser Snifit and then proceed to kill it. They do this to the others too. Does that make them murderers? --- --- My signature? I'd be happy to... NOT TELL YOU!
Aren't the blocks and such in SMB actually the residents of the Mushroom Kingdom Bowser caught and transformed with magic? If that was the case, then it's not like they haven't been doing this all their life. --- Your signature is appended to the bottom of every post you make. If you choose to manually change it, note that it must still conform to the maximum size limit.
Murder implies pre-meditation (at least 1st degree).
I wouldn't even say it's manslaugther, more likely, it's self-defence.
Plus, one can argue that the laser-snifit transformed professor was actually knocked-out, and for gameplay reasons, he just disappeared so you could continue on. --- "Those who would sacrifice liberty for security, deserve neither."