[timmaxw]

If Uruguay can run on 100% renewable energy, the unstated implication is "The US could do it too, we just lack the political will". (As opposed to the idea that "Renewable energy is a genuinely hard problem that will take time, effort, and technological advances to solve.") The implication that "we just lack the political will" can feel like a criticism of anyone who's not maximally-environmentalist. I think that's why people are getting defensive about it.

[aoeusnth1]

Everything you just said may be true, but it’s also true that the US does lack the political will.

[taylodl]

It's impossible to solve difficult problems without the will to do so.

[PaulDavisThe1st]

The will do to do so is frequently more easily accessed when the problems are recognized as more tractable than previously thought.

[AndrewKemendo]

At no point in the article is that claim made.