Should you disinfect a pretty bad cut from a shaving razor?
You should disinfect any bad cut
Anytime you get cut, even if its not a really bad cut, you should ALWAYS clean it. You never know if its going to get infected and how bad it'll be if it does.
For it to heal quicker yes
Yes yes yes.
Yeah unless you want a bigger infection.
Yes I know from experience.
You don't want it to get infected so yes, Disinfect it;-) if you ever want to talk or ask questions, just ask me!