The stat figures can get very murky when you take into account the types of bikes that have ABS compared to the ones that don't and what is the demographics of those that ride those ABS bikes compared to the ones that ride let's say a 600 Gixxer (the squid bike of all)
I believe specific comparisons were made between comparable models with and without ABS (e.g. in cases where it was an option, or in cases where an otherwise-same-model bike was available without one year and with the next year).
I am in favor of having ABS on a street bike.
A common argument that the detractors use is that "a pro rider can out-brake ABS". Well ... Maybe. In an idealized set of circumstances, where that pro rider has the opportunity to do a number of practice runs to feel for the available traction, perhaps. In the real world, when that car turns left in front of your path, you don't have the opportunity for that practice run, AND your fight-or-flight instinctive reactions take over. Those instinctive reactions will go one of two ways: "OMG I don't want to fall down" so you under-brake and hit the car, and "OMG I need to brake as hard as possible" so you reef the brakes as hard as you can and lock them up or go over the handlebars. ABS gives the confidence for the rider to not worry about either set of circumstances. Trust me, there is no "modulating the brake" or "threshold braking" when there is a car across your path that you know you're going to hit.
I've been there. At the time, I had 15 years of roadracing experience. I hit the car with the front wheel locked, the rear wheel in the air, and in the process of tucking the front end.
Now as for that pro rider out-performing the ABS ... Maybe, on the older technology systems. I now own my first street bike that has ABS, and it is a modern advanced system. The old systems were only capable of switching the brake caliper pressure between whatever pressure you were applying, and zero. The new advanced systems are capable of modulating that pressure faster than any rider could ever humanly achieve. There is no more chattering, no more upsetting the suspension, no more vibration at the brake lever. The bike just STOPS.
There is a cost factor. It is cheaper than a replacement set of bodywork (by a lot).
There is a "something to go wrong" factor. In half a million kilometers and nearing 10 years of driving ABS-equipped cars, I've had exactly one wheel speed sensor go bad. And that's something subjected to salt water immersion in winter, a factor that a motorcycles likely will have minimal or no exposure to.