“The real problem with this murder is that the police didn’t do enough to stop it. You should blame they police just as much, if not more, than the murderer.”

No, the murderer is to blame. Yes, you can criticise those that should have prevented it for not doing more, but the people actually doing the bad thing are worse than the people not stopping the bad thing.

If someone stole your wallet the person who stood there and watched it happen is not the person you should be focusing on.