Why do many still today question whether or not Vietnam was worth it?

Many people question that topic since it was a CIVIL war.  The country was fighting between itself.  The U.S basically barged in and helped the side it thought was better.  So many people died during that war.  Many people believe that if Southern vietnam wasn't controlled by the U.S during that war and if the U.S had just stayed out of it then so many people would still be alive.  On the other hand many believe the exact opposite.  I hope I helped.  Pls mark brainliest:)

we pointed them north: recollections of a cowpuncher by e.c. “teddy blue” abbott tells us of the history of nomad cowboys in north america. as the   frontiers began moving west, trails of cowboys of the 1870s and ’80s drove herds of cattle from texas to the northern ranges and railheads, and then rode back south to do it again. they gradually pushed   native americans out of their lands, until in 1889 the   government transferred white   colonists the indian land.