The concept of "the greater good" seems to be being ignored here. The police [nor indeed any other public body] do not have infinite resources, and even if they had, should these resources be used on single cases, however tragic, however newsworthy?
The media mindset these days is that someone, some public body, "them", must be held to blame for every tragedy.
Sh1t happens. people by and large do their best, people make mistakes, and still sh1t happens.
Time to move on, except for the grieveing famliies. Not their fault.