[RobotToaster]

It's also stated in enterprise that Klingons do have other castes, the warrior caste is just the most dominant. (Although the caste system doesn't seem strictly hereditary)

[jitl]

is it really that far fetched that instead of bikes, football, and basketball, klingon society decided to give all their kids batleths, so everyone grows up really into it?

[red_admiral]

That sort of happened in a brief period in mediaeval England when they gave everyone longbows.

[tolciho]

Japanese militarism was a thing recently, so the kids got eveything but the batleth.