We have every reason to suspect they had no idea who would be carrying these pagers. That they did consider any Hezbollah member to be a legitimate target, be they senior administrators at a hospital, media workers, politicians, etc.
At the very least they must have known that higher party members (i.e. politicians) would be carrying the pagers, and that they had no idea who was actually close when they detonated, and simply didn’t care if children got hurt.
An army who is on trial for genocide does not deserve the benefit of the doubt.