Regulation create barrier to entry, not about safety. If safety you want, impose high penalty/punishment for reckless behavior.
Regulation creates a barrier, sure - a good barrier is one which requires training, practices, and equipment to promote safety.
Likewise, with high regulation, there still people who drive recklessly.
Regulation creates a barrier, so its not easy for newcomer to enter and compete.
Becoming a good trucker still requires training, practices, and equipment to promote safety regardless of regulation.