When the NYPD have a guess at who did around 30% of murders, compared to the London police at 90% - and despite more funding than a small army - you have to wonder if the problem is purely resources. In fact, the vast majority of police are assigned to tasks like traffic enforcement, in part because that brings in more reliable revenue.

(I'm using "guess at" to refer to clearance rate because if the cops tell a prosecutor they think you murdered someone and the prosecutor says it was obviously someone else so they're not charging you that's generally counted as cleared.)