You have described no legitimate use for a nuclear briefcase, yet the legitimate use for a suppressor has been described to you repetitively.
I don't find it legit in the least... given the existence of earplugs.
Suppressors are used to make your position less clear, keep people from hearing your shot, etc.
Granted, a higher caliber gun with a suppressor is still pretty loud... but a .22? A .32 auto?