This would be the perfect time for Israel to invade Lebanon, when a huge chunk of Hezbollah leadership is incapacitated and they have no means of communication.

Brilliant observation. I'd expect that next. The media is treating this like a show of force and it is that. But it seems that the device attack creates an enormous temporary advantage for Israel.

The device exploder seems very humane by the standards of warfare - killing the highest value commanders and decision makers, and pretty much sparing most grunts and most of the general population.