Cossacks are kind of like Slavic Hillbillies, volatile, dumb, derelicts who wanted to get away from Statehood.
You have been reading too many books.
This is no longer the 17th century when Cossacks were reputed to be the Tsar's most fearsome shock troops.
My Grandmother came from a Don Host cossack family: she went to medical school in Saint Petersburg, her father was a general in the Imperial Army, and her brothers were trained engineers.
Sidebar - my favorite quote about Cossacks came from Napolean, who is reputed to have said if he had Cossack Calvary in his Grande Army, he could conquer the world.