The evidence broadly shows that the people who vote for this will not change their mind. Not when their farming business is likely going to fail due to tariffs (~78% of farmers voted for this), not when their North Carolina saw mill that has been in the family for forty years is forced to close (Mackey’s Ferry Sawmill), not when their ACA subsidies and SNAP benefits are pulled. One's presence and voice is immaterial. One can both vote and donate to campaigns from abroad; there is literally nothing one can do on US soil you cannot do from abroad while not exposing yourself and potentially family to a slowly failing and degrading governance system, that by all observations and evidence, hates its citizens with policy.
As I often ask when problem scoping, "What is your time horizon?" Will things change in 3, 5, 7, 10 years? ~2M voters 55+ die every year in the US, ~5k per day (mental models are rigid, progress occurs one funeral at a time as Planck said). Young voters were very excited for this admin, and now that vibes have met reality, they are not so excited, with a roughly 50 point swing in favorability in polling. I expect a swing back, considering recent elections over the last few weeks, but it will take quite some time.
So, from a first principles perspective, if you can live somewhere safer, better, or other idea of more favorable while losing nothing, why not? You can always move back if the US gets its shit together, and if it doesn't, you have made a home and life for yourself somewhere more favorable. Leaving is not giving up, it is merely having a better life experience while sacrificing nothing except US in person work opportunities and proximity to friends and loved ones (if applicable) for the time horizon in question. Some may feel entitled to functional governance systems, and they should (imho) vote with their feet and wallets. It is a rational evaluation in a volatile environment.
And if another country is offering you a residency visa or path to citizenship, they clearly want you. You might not be aware, but the developed world is going through a working age population crunch due to structural demographics; skilled workers are in demand, as well as those with either investment, pension, or social security income.
(think in systems)