A poorly put together gun is perfectly capable of crippling the wielder, and most bombs light enough to throw won't reliably kill everyone in a room, especially a large room. Also, guns are harder to get right than bombs. That's why, in military history, hand grenades and land mines came first, then muskets, then rifles, instead of just better and better grenades. That's why the saying is "every Marine is a rifleman" and not "every Marine is a grenadier."

A well-made Friendly AI would translate human knowledge and intent into precise, mechanical solutions to problems. You just look through the scope and decide when to pull the trigger, then it handles the details of implementation.

Also, you seem to have lost track of the positional aspect of the metaphor. The room outside represents the future; are you planning to stay behind in the garbage compactor?