I have nothing against Ukrainians but I don't think their plight is worth risking U.S. lives to correct. Taiwan, that's another matter. If the CCP is allowed to take Taiwan then the U.S. loses credibility in Asia and the CCP will OWN IT. That cannot be allowed without a fight. Kinetic, if need be. We wouldn't be alone and Xi knows this. That encourages me because I doubt he'll actually pull the trigger if he believes all of his neighbors will come in shooting, along with the U.S. military.
If he does decide to try, it will certainly be due to the calculation that our politics have rendered us into eunuchs, with a senile old man posing as president. Wars have begun on such miscalculations many times.