I can't tell which window he struck, either way there was going to smashing glass everywhere it will be spun as the "wrong" window regardless. The back window may have actually had more clearance space between window and kids (much more room in the back of a van to move away), while smashing the passenger front window would have trapped the son right there with nowhere to go from shattered glass and possibly getting struck.
The lawyers can just as easily spin the front as the more "intentionally" violent intentionally harmful move. Or if it was the back, they'll spin it so that one was.
The big one is the cop who opened fire, what did/didn't he "know" going into this.
What did he think had happened until then.
Did he know there was kids in the van? Did he just get assault on an officer alert! And no other details?