Because they disagree that it is in America's interest to promote home grown fossil fuels production. They believe that climate change poses vast threats to U.S. interests, that the only way to arrest climate change is through global coordinated action, and that the only way to accomplish that global coordinated action is by the U.S. taking the lead in reducing fossil fuel production.

That's merely one example. Which political party supports mass, unchecked immigration? Or routinely has people with guest credentials and speaker invites to Davos?

We could "afford" to continue our present tariff structure with Canada going forward. We can "afford" to continue to not own Greenland.

Nobody really wants to buy Greenland. On Canada's tariffs, what Trump is talking about is the current trade deficit between us and them.

Simply to recognize that rejecting Trump's vision of foreign policy doesn't mean putting America's interest "second," or whatever the flip side is to "America First."

The other side has yet to articulate a coherent vision/strategy/single goal of what America's national security posture should be other than "The opposite of what the Orange guy wants".

Here's an Outstanding metaphor for what the democrats think along these lines:

democrats.org - National security
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LOL!

Hardly "all by ourselves."

Yes, mostly by ourselves. The European position on continental security is to defend Europe right down to the last Pole or American. That's why they all shat bricks when Putin invaded the Ukraine.