Why are inexperienced, timid drivers allowed to get their license?

I live in the Texas Medical Center in Houston and encounter more than my fair share of crappy inexperienced drivers on a daily basis. They do not grasp the concept of “traffic flow” and god knows I RARELY speed. Not to sound racist, but the large majority is comprised of Asian and Indian drivers who go about 35 mph on freeway interchanges. A lot of times they are very ignorant to other drivers and the fact that their timid driving puts others on the road in serious danger.

What gives? I understand they may be new to driving, but downtown Houston freeways are not the kind of places you should be learning to drive for the first time.