Or the sabotage was on the verge of being discovered and their options were either to use it at an inopportune time or lose the ability to use it at all.
How do we know this didn't do this but in reverse, being used to disrupt an attack Hezbollah had planned? Edit: People seem to be ignoring the large amount of Syrian operatives this hit as well.
I'm surprised they used it out of such a concept. It is almost heartening, because it suggests no such attack is currently anticipated by Israel.