the reason why i said on principle is that i rely dont think that super mario
kart will have a backdoor in it
however if you get a modern program for the snes it could
take advantage of a bug in the emulator
also even if you do get super mario kart from the internet
it still could be made to do malicious things
as you dont know who has modified it
the only way i would rely trust it is if i or someone i trust
got the rom off the cartridge themselves
something i dont have the knowledge to do
the chances of a backdoor in my computer being cased
by a snes rom is low but i dont want to start taking chances