The gang of thugs possessed the Ring of Power, stolen from its rightful owner, and capable of killing millions; it’s like a nuclear bomb!
If some gang of trespassers snuck into your dwelling with a nuclear bomb, I think “shoot first, ask questions later” would be the order of the day.
The only character that seemed to have his shit together was Sauron. Even Sauramon agreed the safest thing to do would be to peacefully return the ring to its rightful owner before anyone got hurt...