1. Yes, venom glands could grow back over time- just like tonsils, gall bladders and appendix often do.
2. As an experienced gun owner I know that keeping my guns unloaded in no way lessens the risk of accidental shooting. That is why I keep all my guns loaded at all times. If I'm afraid to keep my guns constantly loaded I shouldn't have guns at all, right?
3. Unnecessary surgery is a cruel thing to do. That is why I never spay or neuter my pet dogs or cats.