Front Suspension Control Arm problems of the 2001 Lincoln Navigator

The steering control arm assembly and front suspension of the Lincoln Navigator broke while I was driving home. It was lucky that it happened on the local street and the speed limit was 30 mph. I wa sable pull the car to safety. The year of the car was a 2001 model. I thought it was too early to be broken. We were not aggressive drivers. We just used the car to commute from home to work on the highway and the local street. We went to the dealer to fix the problem. The dealer blamed it on the extreme tire, (mickey thompson : baja crawl radial that we used. We were skeptical of this answer. May be it was a manufacturing defect. The steering control arm assembly and front suspension should be strong and durable to gaurantee the driver safety. It should not be broken easily like this. Could you give us some advice? who will be responsible for this case? should we keep or sell this car.