Russian air defense shot down a civilian airliner mostly full of Dutch nationals and the response was just condemnation and tweaking the sanctions a bit.
However, to send missile to primary school killing hundreds of school girls on the very first day of the war, if intentionally is just pure evil.
Remember Hanlon's Razor, and remember how incompetent the Trump Administration has been in everything ever since he took office.
Israel has hit schools before knowing full well that it's a school (in war against Egypt). May well be policy.
Many of these kids would have been kids of IRGC. Likely that was the reason.
Objection. For a hypothetical actor wanting to set the world economy on fire there might be a benefit of enraging the enemy to lower the risk of early deescalation.