Singapore and Luxembourg don't because they depend on us to do it for them. Singapore is a great example actually. I had a friend from there and he described their military as such: they have a small defense force, designed only to hold off any attackers long enough for Uncle Sam to arrive.
Anecdotal evidence aside, under the US-Singapore Strategic Framework Agreement, our navy regularly rotates combat ships through Singapore.
The United States is the largest consumer of oil in the world, double that of the next highest which is China even though we have one-quarter of their population. Relative to other countries, oil has a grossly disproportionate impact on our economy (just ask anyone who lived through the 1973 oil crisis) and so we have no choice but to protect those shipping lanes. Other countries just get to reap the rewards. It is unjust, but there is nothing we can do about until we wean ourselves off of oil. Which is the main reason I think switching to electric cars (even if it means a little government help) is a very good idea.
Hmmm, 1973. Why does that year stick in my head? Ah now I remember. It's because we had other interests that were decidedly secondary to getting oil. If all we cared about was oil it would be plentiful, no shipping lane protection and no 1973 oil crisis. Not to mention we had just closed the gold window.
Which is the main reason I think switching to electric cars (even if it means a little government help) is a very good idea.
Ugh. If a little is good then a lot should be even better. Why subsidize $75k electric cars for the privileged when we could double or triple the subsidy and get them $150k electric cars?