The answer is no. The nature of the attack does not make it OK even if it turns out that only military personnel had these pagers. It is not OK for Israel to weaponize consumer electronics which are widely used in a civilian area, even if the users at the time are most likely military personnel.
But this question is irrelevant because this is very unlikely to be the case. The victims seem to be many civilians.
The answer is no. The nature of the attack does not make it OK even if it turns out that only military personnel had these pagers. It is not OK for Israel to weaponize consumer electronics which are widely used in a civilian area, even if the users at the time are most likely military personnel.
But this question is irrelevant because this is very unlikely to be the case. The victims seem to be many civilians.