I wouldn't bet too hard on these two points, actually. For one thing, the bystanders killed in this are going to be from the same demographic as the gang members themselves; dirt-poor, coloured, illegal aliens or some combination thereof. A depressing number of people outside said demographic are going to think, "well, that's one less welfare cheque coming out of my taxes" and wish this sniper all the best; just look at some of the reactions to what happened to Jean Charles de Menezes, or Ian Tomlinson.Kamakazie Sith wrote:The populace would rise up against it because as others have repeatedly stated...innocents will likely die even if their innocence is just perceived (just look at how many feel that Lovell Mixon was innocent)...
... Another consequence to consider by the police would be an all time low of public mistrust thanks to the perception that the police are allowing these killings because the victims just happen to be gang members.
I wouldn't be enormously surprised if factions within the local police felt that way too, to the point where they started feeding this guy information; I'm sure it's not unheard of for inner-city precincts to play gangs off against each other, so how would that be any different? They can always tip the gangs off about him if he becomes inconvenient. (I have incidentally heard ugly rumours of the British security forces playing these kinds of tricks with the Ulster Loyalists, who are themselves a shining example of how concerned citizens doing their own law-enforcement can and usually does go horribly, horribly wrong.)
Also, there's another factor that deserves a mention. From a pure body-count perspective, especially of bystanders, it's debateable which is worse; a short period of all-out war and then a somewhat longer period of relative calm before another faction gears up to fill the resulting power vacuum, or the continuous low-level skirmishing that constitutes the status quo. That this solution would require significantly less effort and cost significantly less money than doing anything to actually give inner-city kids some upward social mobility options besides music, sport and organised crime would be the icing on the cake... if one happens to be ruthless and utilitarian in outlook to the point of sociopathy. I personally would consider that a drawback in a candidate for public office, but... well, there's other schools of thought.
And hey, at least it'd mean someone was trying, right? (There is no emoticon that could begin to describe my expression as I type these words.)