Since you used your anecdotal evidence to judge an entire group, I'll counter with mine.
My grandfather joined the army as a dirt poor farmer. Fought in North Africa, Italy and jumped into Germany. Used his GI bill to get a degree in physics, helped develop things like the sticky note while working for 3M in the 60s, 70s and 80s. He stilled served during this time in the NG becoming a full bird. He received his masters in English and published 3 novels, then a collection of poems. After that he went to law school and practiced law.
Pretty impressive for a dirt poor white kid from South Dakota. His son then joined the Army. Using the discipline and leadership it taught him, he earned his PhD in international economics. A few years ago my dad was sent to Zimbawbwe to combat their inflation rate, which at one point hit 79 BILLION percent. Thankfully he helped their government tie their monetary system to the USD to stabilize things.
After having my classmate (senators daughter) call Hillary Clinton to speak at my HS graduation, I too joined the Army. I joined with another dozen kids from my class. This was in 07 and we all had options outsid of the military (several accepted into Ivies, UVA, Georgetown etc..) except that this was the DC area and 9/11 impacted our priorities.
We all at some point have acted like douchebags in a bar, fought some dude, tried to pickup a girl. Just like my experience of highly educated individuals joining the military isn't representative of recruits - neither is your experience dealing with drunk 21-30 year olds who have nothing else to do since they're in Alaska!
Have fun bar tending and painting things on military installations.