Training quantifiably lowers risk - I'm talking about training for motorcyclists. We all have to do some training pretty much everywhere in the world before we become licensed drivers and riders.

In both the UK and US, advanced training courses are available and are recognized my insurance companies who offer discounts.

Anecdotally, the people that I've picked up off the highway have all been on a cruiser-style bike, been wearing improper clothing (usually shorts and T-Shirts) and not been wearing a helmet. Now that's legal here in CO and fine for an individual to make their own decisions. With further training however, you can make better decisions particularly around risk assessment and handling characteristics.

[edit - typo]