Those stupid thugs decided to make a choice in a situation where there was a 50% chance of screwing up, and you still believe there are only one in a hundred incidents where cops manage to get it wrong.
Regardless of whose to blame, perhaps the planner of the raid rather than the raiders themselves, it's galling that there is no "innocent victims compensation" for this kind of thing. There are crime victim assistance funds in some places (criminals get hit with surcharges on their fines to fund this) but I ain't never seen an innocent police victim assistance fund.