Those three groups till now don’t escalate the war, because they are afraid to fight Israel in a full-fledged war, without this occurrence. If they wouldn’t be afraid, they would have already done so.
Israel must KEEP them afraid.
Every terrorist already knows that they could be killed by Israel. It hasn’t stopped any of them till now. and these pagers exploding won’t stopping them in the future either.
I feel like this whole “Arabs love death” thing is a bit exaggerated. I’m sure that many terrorists feel that they can get away with shooting rockets into another country and there is a chance that they’ll get away with it alive. When all of them start exploding in their living rooms, that starts to make them nervous about every step they take. I don’t think anyone, even “death-loving terrorists” could live with a real feeling that every step they take could be their last because their phone/microwave/earbud/doorbell etc. might explode in their face.