Your sentiments are not altogether wrong. Involving ourselves in many foreign intrigues has frequently been a fiasco. With respect to China, the reason they went Communist was in great part due to our failure to support Chiang Kai-shek and too many at State (a den of Communist seditionists even then) directing measures to aid Mao (they also helped Castro, too).
Had Truman allowed MacArthur to conduct the Korean War to the fullest and liberated the peninsula entirely and pressed onward to defeat Mao, we would not have had the problems we had in that part of the world for all the decades since.
Indeed, with a Nationalist China, they’d have crushed the Communist uprisings throughout Asia and we might never need to have gotten involved (Vietnam, the premier example).
Sending troops now isn’t going to work, of course, but surely there are covert means to assist the pro-freedom revolutionaries that we can utilize. Also working to destabilize Red China’s economy is another method, too.
If Patton had green light things could have been different:
In early May 1945, as the Allies shut down the Nazi war machine, Patton stood with his massive 3rd Army on the outskirts of Prague in a potential face off with the Red Army. He pleaded for General Eisenhower’s green light to advance and capture the city for the Allies, which also would have meant containment of the Russians. British Prime Minister Churchill also thought the move a crucial and beneficial one for post-war Europe and insisted upon it, but to no avail. Eisenhower denied Patton’s request, and the Russians took the region, which would pay dearly for years to come. Earlier that year, at the February conference in Yalta, President Roosevelt, with Churchill at his side, extended the hand of friendship to “Uncle Joe” Stalin and signed his Faustian pact. In so doing, the destiny of millions was reduced to mass starvation, blood revenge, and distant gulags. At the time, Patton understood the tragedy of this event and wrote, “We promised the Europeans freedom. It would be worse than dishonorable not to see that they have it. This might mean war with the Russians, but what of it?”
https://www.huffpost.com/entry/general-patton-cold-war-russia_b_5526514
Trump is doing what is our best defense against the Chinese threat to America. That threat is economic. If the Chinese invade Taiwan tomorrow his response should be 100% economic. I care as much about what Chinese do to Chinese as the Chinese would care if Alberta invaded North Dakota.