Two things: If the wheels that steer your car are sliding, then they no longer function for steering. You can turn them any direction you like and the momentum of your vehicle will continue to carry you in a straight line.
More importantly, if you get into a situation where anti-lock brakes are causing more harm than good, then you actually need to let off of the brake and modulate your pressure to maintain that balance right before wheel lock up, and Lloyd says. You have to react quickly to your car in these sorts of situations because there is no technology that is going to do that for you. I can't remember how many times I've let off the brake some to maintain control of my vehicle. In other words, if you find yourself "straining" on the brake pedal then you're not really controlling your car.
I don't know if it was black ice, but I found myself on a downhill road headed into a 90-degree right turn with a VW bus stopped in the opposing lane trying to get up the hill. Every time I braked to slow down, the car started sliding straight into the opposing lane, and every time I let up on the brake the car regained steering control and turned right to stay in my lane. This particular instance was a challenge because I was in someone else's car that was quite heavier than my own. But, still, as the driver, you have to be able to feel the effects of what you're doing to the car. Again, if anti-lock brakes engage and circumvent your control, then you should let off the brake instead of just straining harder, and you will hopefully find the right input to control your car.