I understand that the military has suffered from a lack of public understanding, and at times outright hostility. But I have to admit, I'm a bit short on empathy. You say the "Left was in its glory," without providing much context. Nick Turse's book, "Kill Anything That Moves" finally provides a meticulously researched account of US atrocities in Vietnam, and some much needed context. While I believe that protesters should never target individual soldiers, as I respect and admire the profession (rather they should target the institutions and power structures that get us to war in the first place), 2 million civilians were killed in Vietnam. Many of these deaths were deliberate, and a result of not only a loss of control at the small unit level, but overall policy at the command level. Given this reality, incidents of mistreatment of returning veterans seems like a relatively minor issue when we look at WHY people were opposed to the war.
http://www.huffingtonpost.com/peter-van-buren/nick-turse-kill-anything-that-moves_b_2897858.html
It was a good thing that people were in the streets over Vietnam, and also a good thing that they were for Iraq and Afghanistan. We live in a democracy after all, and going to war should never be taken lightly. Both of these wars were also lost at the cost of hundreds of thousands of civilian lives, and thousands of US/Coalition dead, not to mention trillions of dollars wasted. The threat of terrorism is still alive and well, so what have we gained? In light of the failures of the past decade, I think it is very
reasonable to be critical of the military, and to monitor it's influence on foreign policy very closely. We should also be holding civilian leadership to account for using the military and war in general as a political tool to garner support.