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If you, as an armed police officer, are confronted with someone wearing what you perceive to be an explosive device, who has attempted to or has killed people, then they have to be stopped. That means you keep shooting until they stop moving and cannot initiate their bomb.
Blame Hollywood. The one bullet myth. It takes far more than that to stop someone. Autopsies on criminals who die in shootouts with the FBI have shown that in some cases people continued to fight for 2-3 minutes after their hearts stopped. Continuing on sheer adrenaline.
Plenty of examples of this. This is the one I remember.
https://en.m.wikipedia.org/wiki/1986_FBI_Miami_shootout
50 rounds is pretty controlled really.
They were wearing "suicide vests". If you, as an armed police officer, are confronted with someone wearing what you perceive to be an explosive device, who has attempted to or has killed people, then they have to be stopped. That means you keep shooting until they stop moving and cannot initiate their bomb. This could explain the perceived overkill.