So the basic thrust of your arguement is US forces had self-exploding tanks, bombers who could not hit a beach, and generally incompetent leadership. I believe you also ranted about WWI helmets, ugly casualty rates, fire bombing of cities, atomic weapons and fearsome enemies flying bamboo airplanes.
So, if the US forces were as incompetent as described why do the WWII nations of Germany, Italy, Japan and USSR no longer exist?
Seems to me that despite all the faults, failures and just plain incompetence that you have so carefully located, the US soldier, sailor, airman and Marine simply kicked ass. Something about being willing to say "NUTS".
So my question still remains.
Why should the US protect Europe, Japan, Taiwan or Korea? Why should the US protect the Middle East oil fields when the majority of that product goes to Europe, Japan, and China? What does the US care if heating oil prices in Europe skyrocket?
If you really think the US is going to get involved in your WW3 scenarios, you better explain why the US will be interested.
Actually if oil prices in Europe skyrocketed due to being cut off for example the american based oil producers would simply prioritize selling to Europe. Free market and all that so of course they will sell where they get the most profit. Its also fun how you always expect that everyone wants your help and you base that on WW2.... when the whole world had to band together against Germany.... Which is in Europe.... And is currently a much nicer country then America ever was.... I honestly dont see a problem with the Atlantic Ocean being between us right now. Could perhaps have been wider but one can dream.
I gave you ample evidence on Americas lack of morals, leadership, preparedness, priorities, realistic view point and training. The fact that you exist and X country dont has nothing to do with your "greatness" and you just claiming it is outright childish. A country does not need to be successful or unique in any way to persist. Cant you see how silly you are going "haha we lived longer then youuuu"?
You claim that Germany, Italy and Japan does no longer exist? They are far greater now then they ever were. Who do you think is leading the world in stuff like Technology, economy and social development? Who the heck needs oil when we get our electricity from green energy combined with nuclear power plants?
I believe USA will be the one to START WW3. No one else seams to bother except some arab countries that have not had peace since they invented the stick.
The Germany, Italy and Japan that started WW2 no longer exist. What we now call Germany, Italy and Japan exist by the efforts of those Americans whose morals, leadership, preparedness, priorities, realistic viewpoint and training you question.
Yes, I have been in Germany, Italy and Japan. The US funded reconstruction did wonders. The US funded protection from encroaching powers provided an opportunity for these nations become strong again. If you really want to see the value the US provided to those nations, take a wander through, East Germany, Czech, Slovak, Poland and Hungary. (Yes, I have.) There you will see what happened when the morally bankrupt, incompetent, etc Americans were not around to make it all better.
Your fear that the US will start WW3 is, IMHO, unfounded. Historically, the US is an isolationist country with strong internal pressures to disarm. You pointed that out quite correctly with your observations regarding exploding tanks, crappy equipment and poor training. If the US were intent on conquering the world, we would be paying a little more attention to the military forces needed. Right now, in fact, the US military is downsizing. Our nuclear weapon stockpiles are being reduced. Our manning levels in all the services are being cut. Now, I am sure you can come up with some way that points to the US getting ready for WW3.
BTW, I am delighted that you take such joy in using the peaceful nuclear technology developed by your friends, the Americans. As someone who spent my first years as an adult operating a nuclear reactor, I have always felt we have not benefited enough from that technology.
Back on topic, bitcoin will only be useful post WW3 if there is enough of the internet left to serve all those who want to use bitcoin. Since we have not yet reached agreement on what WW3 would look like, it is foolish to attempt to answer the question.