It is akin to saying 'I recycle my meagre household waste, I am doing my best!' while that's addressing probably 1% of the actual problem (most recycling ends up in garbage and corporations are bigger polluters than individual consumers).
If I am to put words into OPs mouth, we should be pushing for real changes at a society level. This would mean a bigger and more intrusive governance which will come in the form of things like no meat, 2 children per family, all electric cars, no 2 day shipping and so on. I am sure there one in there that will hurt everyone, which is where people should be willing to put their energy into.
FWIW at a macro level, I do see the point. I can put money on the fact that people won't elect or push for societal changes that actually affects them though. These are the reasons why giant systems pretty much never completely overhaul themselves: They might course correct a little, but unless aliens invade or a giant conflict happens - we are kinda set. (Do you see my cynical side yet :)
That's a uniquely American problem. Maybe America should fix itself so it doesn't take so long to build infrastructure.
So, you know, why not push for the latter in the meantime while we work toward the former?
You only mentioned airports in your examples. America can't even build rail lines that go to airports!
Speaking of cherry picking, I think that referring to high-speed passenger train alone is an example thereof, especially as it ignores the large and successful American fright train infrastructure. California made the mistake of being too ambitious, a more modest plan from the start would have worked.
As for California, it's just CA, it's the whole country. Where's the high-speed rail in the northeast, where they have the highest density of people who would use such a system? It doesn't exist (and again, no, the Acela doesn't count). What about between Seattle and Portland? Why isn't the federal government involved, since this should be an interstate issue? This whole country is just a fucking disaster when it comes to public infrastructure.
While these are the “right” solutions, they occur over decades. Planning for any rail line, then constructing, takes over a decade. Even in the environmentalist San Francisco Bay Area. Even bus lines. Try a google of “Van Ness BRT” to get a sense for how slow infrastructure projects work.
You can buy a Tesla or a Leaf or an e-Golf and have significant personal emission reductions today.