Not only that, but they‘re also literal bombs. Remember E=mc^2? With a technology capable of converting 100% of matter into usable energy, you‘d have a pretty scary bomb bomb.
And yet, on the list of bomb bombs Star Trek has given us, it's pretty far down there. I mean, wanna talk about WMDs? Look up Genesis or Generations. Those fuckers are un-nuking stars and collapsing nebulae because why not.