Infusing the market in case of emergency isn't socialism. Socialism is a state of emergency day in and out, it'd basically mean you're bailing out all thousands of businesses and ventures that fail every year, not just one time to stabilize an economy.
You're confusing capitalism with libertarianism though, a pure capitalistic country does not exist, the US is libertarian in its policies, there is room for government in some cases but for most of the rest, government (should) stay out of it. However as time progresses, the US has become a lot more socialist, ever since the New Deal and Social Security was established, we've pumped more and more money into the failing system.
Social Security is a clear demonstration of failed policy - if you were able to invest all your funds into a private fund instead of Social Security, your rate of return would be 4-6x higher - people would retire with, on average, $2M in the bank, instead the rate of return is 2%, barely enough to stave off inflation of the funds you originally 'invested'.