Western Military members are indeed trained to best represent their Country, and to not make their country look bad, but, there have been untold atrocities committed by those Militaries, think Vietnam, and all the rape victims and senseless slaughter of civilians. And what about if the soldiers that represented Earth were Nazis, or Maoists, or many others? You are cherry picking a specific Military and closing your eyes to the bad they can and have done.I dont know marines, but dont they have all kind of personalities within the ranks?Imagine there was an alien species, and 99.9% of the humans they ever encountered were United States Marines, for whatever reason.
There view of mankind might be a bit distorted...
I've never been in the military. In fact, I would never join the military. But that said, from what I know, if all aliens ever saw of our species was the military (or even just the marines), they'd be seeing a better quality human than the average, not worse.
American enlisted personnel are selected for intelligence (ASVAB, or whatever they're calling it now), and they're smarter than the average American. They're certainly more squared away, disciplined, and imbued with purpose. Far less prone to drunkenness, addiction, crime, and other pathologies.
That goes double for officers, who are generally college educated.
As far as less likely to become addicted and to respect women? Do you have any idea the statistics of Soldiers who have come back from Iraq, that have become addicted to drugs or alcohol, how many have committed violence, including murder, after returning home? How many have brutalized women? War is not pretty and it's not clean and sterile.
Also, when we need an ally, it's very easy to shutter your eyes from their faults. Sadam Hussein was ally against Iran, we built up the infrastructure that allowed him to stay in power and be such a tyrant for so long. India is a good ally to us, and have had nasty showdowns with Pakistan. Pakistan created the Taliban, who sheltered Osama Bin Laden and allowed him to build an army, and used Afghanistan as a Base to attack us on 911. And yet, Pakistan is our ally. There are numerous times we ally ourselves with people who don't represent or live by the values we purport to, allying with the Klingons is no different.