[WS:] Good point, indeed. Most of that trending comes from within these countries, rather than from the US interventions. It seems that there is little causal connection between the two.
That leaves us with two questions:
1. What are the causes of trending toward neoliberalism? 2. Why does the US intervene, if the countries are trending toward neoliberalism anyway?
My answer to #1 is, surprise surprise, sea changes in the class structure. More specifically, the growing power of the techno-managerial class. There is an elective affinity between this socio-economic class an neo-liberalism.
My answer to #2 is a bit more complex and it involves a peculiar structure of the US political institutions. To make a long story short - this structure is designed to constrain government initiative through byzantine edifice of "checks and balances." There is however, one exception - foreign policy, especially military interventions that fall short of full blown wars. The POTUS has considerable discretion in this area, which means that he can do it at a rather low political cost vis a vis acting in the domestic spheres. And since there is little political cost of overseas military interventions, there is also a temptation to do it for appears to be trivial reasons.
To put it in another perspective - for the general public war looks like the last resort action after less serious measures failed. It is so, in a big part, because the cost of war is very high to the general public and measured in the lives of relatives and friends as well as other sacrifices. On the other hand, the reverse is true for the POTUS due to the peculiar, and I may add idiotic, nature of the US political institutions, under which domestic interventionism is far more costly in terms of political capital than foreign interventionism.
To sum it up, the US intervenes overseas mainly because it can do it at a relatively little political cost, so it does it for quite trivial reasons that would not qualify as a "legitimate" casus belli in the popular discourse.
Wojtek