Unrelated to the current issue, this 'blaming the public beta testers attitude' is totally wrong. The developer is definitely responsible for any bugs or issues in the game, if the community fail to find them it is still the fault of the development team. 
Now whether this issue with the tyres is an actual issue, I'm unsure, but as it has actually effected the balance of the game. Whether the community see it as a positive or negative balance change, the community didn't make the change, the developers did. The devs are wholly responsible for it.