Morality has a bearing on it. Not letting die, or for that matter, enabling a minimally humane life for everyone, is as important, or more important than the dictum against (potentially unjust) taxation.
I see why in the US one might be against this, as I've lived there (working at a great IT job in central San Francisco), and have seen the poverty, and the human suffering (not to mention the smell of bums on the bus). Probably feels like there'll be no end to it, and then, in order not to feel guilty or bad, one closes ones eyes to it by believing it's their own fault; 'lazy smelly bastards!', but that doesn't change the moral reality of it.
When judging oneself, feel free to be ruthless like Ayn Rand, when judging others, please be considerate, and take into account more than economics alone.
In a way I evaded it too. Not by borking up my morality, but by voting with my feet when the opportunity presented itself. I am back in the UK now, and happy to be part of a society that treats it's weakest members well (or ok-ish at least).
I wonder what it is between the US and Europe, that we have such different notions of (social) justice. Perhaps it is because Europe has more history, that we have seen over and over that wealth is often gained (and lost) by luck, that often it accumulates over dozens of generations in the hands of the few. While the US is only now developing it's own aristocracy. I even heard a British nobleman once vehemently argue that wealth is not deserved.
So yes, being pragmatic we do allow the market to flourish, and do allow the wealthy to enjoy their wealth, but we don't confuse economics with morality, and moderate it's excesses through progressive taxation, some redistribution, and universal health-care. Human life and happiness trumps justice on the economic plane.