Well, (a) as mentioned earlier, I emailed the director of the program in Philadelphia, hoping to ask her, and got no response, and (b) aside from that I have no idea.
It seems to me, however, that you are the one making the fairly specific claim. You are claiming that there was sufficient evidence that this program, as implemented, would not work; and that the fact that it was implemented anyhow is evidence of liberal stupidity. In other words, you are claiming that the program is sufficiently similar to the ones mentioned in the studies you linked to that it could be presumed to be guaranteed to fail. Which is why I brought up the issue of being an expert in sociology and environmental community studies or whatever the heck field of expertise it is that one would need to really evaluate these things. I mean, it’s entirely possible that a truly IDENTICAL program could be reasonably expected to have radically different outcomes due to the demographics of the community in which the program was being implemented, or other factors that make Philadelphia in 2012 different from some other city in some other year. Beats me.
But to me the larger issue is this: I think we both agree that there are times when the government should spend taxpayer money to try to address issues in society. I’m also willing to concede that, overall, the generically liberal philosophy will do so more often. That is, if there was a magic button that could be pressed to instantly cure childhood obesity across the US with a 100% success rate and cost $50,000, all but the most caricatured of extreme conservatives would agree to spend that money, whereas if there was a program that cost 1000 times that and seemed likely to maybe help the situation some, then you might find something that some, but not all, liberals supported, and few conservatives supported. And that’s fine. Reasonable people are supposed to disagree about things, let the marketplace of ideas decide, etc.
And without actually having access to the discussions and proposals that let up to this Philly plan, I feel like I can’t really say where on the spectrum it lies. It’s certainly possible that it will, in the fullness of time, be proven to have absolutely no positive effect whatsoever, but was still, given the information that was available at the time it was begun, a reasonable thing to attempt. It’s also possible that it was in fact a la la liberal fantasy with absolutely no substantiation or due diligence put in ahead of time, and your criticisms are well founded. But in neither case does its existence somehow provide damning evidence for a fatal flaw in liberal philosophy in general.
Liberal philosophy, like conservative philosophy, has its strengths and its weaknesses, and you could probably make a reasonable case that one of the weaknesses of liberal philosophy is that it’s more likely than conservative philosophy to go overboard on spending money on plans like this without sufficiently solid justification… but by the same ticket, one of the weaknesses of conservative philosophy is refusing to consider plans like this even when they deserve to be tried.