The person who decided to release this illegal should be charged with Accessory to Murder.
. . . the [ICE] detainer was not honored" [by S.F.]
I believe that's S.F. policy -- ignore ICE at will.
Perhaps suing the city using the doctrine of vicarious liability -- the authority responsible in this case is the city having more or less signaled the criminal that what he's doing ain't so bad and he's protected.