Plus, those weapons still had propulsion systems, which could generate a pretty good bang upon impact.
The warheads are clearly still in the torpedoes but the fuel has been removed to make room for the bodies.
Wait a minute here! Firebird says that the torpedoes had their warheads removed and their propulsion intact! And gerbil says that the torpedoes had their fuel removed and their warheads intact! So which is it?????

Klingons see Federation technology impacting their planet, you really think they're gonna ask questions or do an investigation?
Klingons captured Starfleet enemy personnel and… did nothing! Klingons saw a Starfleet enemy ship off Kronos and… did nothing! Klingons saw a two enemy ships fighting each other and… still did nothing! Did you see them going to war or at least responding somehow? In that movie or the next?
Like I already said, that "script" is so full of holes that you can fly the Enterprise inside them. And no, not the small TOS Enterprise but the huge JJprise.