Tires: tires- dry rot, judgement call, tire inspection

Question
I just bought a car three and a half months ago. This past Sunday, my passenger front tire blew out. When inspecting it, my boyfriend said that it was dry-rotted.  When I took it to the local tire place, an employee confirmed that the tire blew because it was dry-rotted.  I had him go ahead and check the other three tires as well and he said they were dry-rotted too.  When I bought the car, the dealership was supposed to have done a 115 point inspection of the car,including tire inspection, since it was previously owned.  My question is: if they did the inspection, shouldn't somone have seen that the tires were dry-rotting?

Answer
Carina,

I disagree.  Tires do not blow out from dry rot.  While the tires might be old - and they might be dry rotted - the 2 things are independent of each other.

So it is quite possible the folks that inspected the car didn't feel the cracks were bad enough to warrant removal.  This is a judgement call, and some folks see these things differently.