Tire Bubble problems of the 2009 Toyota Matrix

I took my 2009 Toyota into my local tire dealer to have it aligned. Mentioned that it was pulling to the left at highwayspeeds and kind of bobbling when I started up. Service man said it might be the tires, not the alignment. It was. The three original tires on the car, the original equipment not warranted, all showed tread separation. (he also said he'd "never seen this kind of problem on three tires at one time. )the steel belts were coming through the tread. The man said that driving on the tires might be dangerous, so I had to put new tires on it--not goodyear. The fourth tire, which I put on the car a couple of years ago (when the sidewall bubbled) was fine--plenty of tread, no signs of wear that might have come from poor maintenance. Note that your form only allows me to note one tire location. Three tires all showed the same problem. The service guy didn't know which location the good tire was on, so I can't tell you three specific locations for those three.