Maybe it's just me, but the last time I read the US Constitution it didn't mention capitalism. So why, when democracy and capitalism come into conflict, do so many people choose capitalism over democracy?
The US is a representative, constitutional democracy and a federalist republic. What does government oppression (aka tyranny) look like in such a government?
There comes a point when the people demand the government do something. When the majority is large enough, that's not tyranny anymore - it's representative democracy in action. At that point, if the government fails to do what the people demand, that's tyranny.