"ABS is available only on "hog" class road-only bikes."
Definitely not the case.
The most advanced and effective ABS systems are on the fastest and most powerful sports racer bikes, such as the Honda Fireblade and The BMW R1000.
There is a strong luddite tendency among many bikers, and many dislike any increase in technology (Maybe that's why Harleys are still fitted with such a big, ugly lump of agricultural machinery where the engine ought to go!)
Others welcome anything that makes riding easier, safer and more comfortable. They will choose ABS where it is an option- but they are probably more safety conscious anyway.
Safer riders on safer bikes- It's hardly surprising they have fewer accidents!
Incidentally, it is the weekend road warriors who are most likely to crash. They simply do not practice riding skills enough to actually master them. 365 day per year riders learn survival on the road, and will choose ABS if possible because they know it increases their chances of avoiding trouble. They will also be able to cope without it!
Cheers
Dave