No children likely, but the sacrifice still needed to happen to be in the club.
Speaking of 'children' and 'sacrifice' - I have seen pictures from the shooter's 'manifesto'. I can't obtain copies that I can post here, but one is a drawing of the shooter, gun slung across the back, addressing a mirror image of the ancient god, Molech.
Molech was a god that required child sacrifice; this shooting was a case of child sacrifice.
When I say that we are in a war that is also spiritual - and it involves ancient spirits (gods) that are pressing into this modern social context - here is clear proof of my observation being correct.
If I can find those images available that I can repost I will attempt to do so. I suspect that the difficulty in posting them is imposed reality - for now... or just my frustrating ineptitude with present search engines.

Here is an image of the ancient god figure:
