You mean as an actor? Yeah, you shouldn't be the sole safety checker, but you should definitely accept the responsibility of being the final safety checker. Because, finally, the gun ends up in your hand. Your finger ends up on the trigger. The barrel ends up pointing wherever you decide to point it.
It seems to me that you should absolutely insist on getting trained on how to personally check and clear each and every gun you're expected to handle on set. If you're too gun-phobic, or that just seems like too much work to you, then you have been mis-cast. You're ethically wrong for accepting the part.