One needs a minimum of about 60hp on a bike for safety reasons. 50hp on something agile like a Supermotard and 70hp or more on something heavy. Choppers are inherently unsafe for the lack of handling.
Yes, more power means more safety. Not more risk.
As biker you are vulnerable as can be and breaking to standstill is the least favorable option for you can be rather sure some idiot driver behind you is going to shove your bike over your leg after you managed this world-record breaking. With the ugliest injuries ever. Never stop in cars line, go to the side or better besides a another car or if unavoidable have a free line in front, gear engaged and a look into the mirrors.
To drive safe one needs to regard all car drivers as insane debile morons up to do anything to hit you. Or just think you are driving in Joburg. Your main and best option is the rescue straight out of the danger. And there is always some space to go, I lost once both mirrors between two trucks but the guy riding with me who decided to break lost his life.
If taken by surprise (what should not happen) break hard, find the gap, accelerate hard through and done.
Not rarely you can hear the distinct "thump!" the sound of a car hitting another into the back.
Thats where you would have been.
For the necessary acceleration 60hp are just enough, good torque is a bonus and a training with a good trainer who focuses on the active escape is a big plus. I did this twice and would do it again so I find one at a good time and place.
And never forget: If you make it through the first 5 seasons your chances on an accident are far less then for the usual cardriver. The first two seasons, well yes, thats thinning the herd so to say.