Please don't misunderstand what i'm about to say:
I'm not condoning speeding or saying its safer, but what i have learned from driving/speeding in my younger days in my car/bike is that you need to practice the fast stuff too, if you're always driving slow and something happens at faster speeds you're not prepared for it, people panic braking on the highways cause more accidents, i see it all the time.
Know your vehicles limits, the better you know your vehicle the safer driver/rider you will be. In my car i know its acceleration and braking performance, its cornering ability, when it will lose grip. The bike same thing, a simple example, my bike when gunning it full throttle, changing from 1st to 2nd pops the wheel just enough that if you're applying steering at the same time you're gonna have a bad time. Now imagine not knowing that one day in an emergency situation.
All i'm saying is knowing your vehicles limits makes you safer, but practicing those limits makes you calmer in emergency situations making you again safer, how you attain that knowledge is the tricky part.