During my time in the Bundeswehr I was tank-gunner, tank-commander and a tank-platoon leader. One does not shoot a tank gun at anything by accident. One can clearly identify targets through sophisticated, magnifying optics – day and night, in rain and through fog. Reliably identifying, shooting and hitting a target at 2000-3000 meters is easy to do and can be learned in a month or so.
A modern tank is quite a secure and comfortable place unless there are capable opposition tanks or sophisticated anti-tank rockets nearby. None of this is the case in Gaza. There is little stress for the guys inside.There is therefore absolutely no justification and excuse for this:
…
Two tank shells exploded outside the Gaza school, spraying shrapnel on people inside and outside the building, where hundreds of Palestinians had sought refuge from fighting between Israeli soldiers and Hamas militants. In addition to the dead, several dozen people were wounded, the officials said.
40 Palestinians killed in IDF strike on UN school
Those must have been HEAT rounds.
Israel Military Industries – 120-MM HEAT-MP-T CARTRIDGE M325 (CL 3105)
This was obvious willful mass-killing of civilians, not infantry, with superior weapons.
The Israelis claim they hit civilian targets because Hamas fighters hide there. They have never provided proof for that while Israeli troops themselves take over apartment buildings with the civilians inside and use those as firebases.
But active opposition to Israeli forces from the people at the UN school is very unlikely.
It is obvious now that the Israeli campaign has the sole purpose to destruct Gaza and Gazans people. This is not about Hamas or a few stovepipes and Chinese rockets that the Islamic Jihad (sponsored by whom?) is launching into Israel.
This is industrialized killing of civilians for the "fun of it".