> Some US highways
I'm sorry, but from a European perspective, this is the problem, not bikes. If your roads and driving culture encourage driving a tank for safety, that's a bit less than ideal.
I commuted to work for 5 years on a moped. I never used a highway, almost never exceeded 50km/h, and had 2 accidents during that time; both resulted in just a few scratches and bruises.
In another post, you said: "maybe speed was a factor" - actually, it's the only factor. If you never go too fast and never use roads where others may go too fast, you're safe - at least from life-altering tragedies.
If, on the other hand, it's generally impossible to get where you want to without using highways, or the sheer distance forces you to step on it - then yeah, don't buy a motorbike. Just note that it's not the bike's fault!