If I was to use a Black & Decker power saw and power sander, in a race to see which would move down a plank of wood the fastest, only for the power sander to veer wildly of the plank of wood and remove about half the skin on my shin.....then it's not Black & Decker's fault. At no point is that a recomended useage for power tools.
So it stands to reason that if the teams are using the tyres outside the recommended parameters knowingly, then they can not blame the tyre manufacture if and when there are failures. Much like running an engine at a higher rev limit than normal there is a risk/reward calculation to be undertaken and with the lack of any proper testing done on these tyres on this seasons car then the risk was going to be higher than normal than say when they used Bridgestone and Michelin tyres when mid season testing was available.
Pirelli should just go out on the full attack and lay the blame at the teams and the FIA for this. The FIA wanted degradable tyres because of a freak race back in Canada which we all enjoyed and the teams rejected a compound change after 'Tyregate' which by all accounts was to be more durable than this compound and would have likely prevent these blowouts.
It's little wonder that a lot of pressure is being put upon Pirelli when the contract is up this season, the cynic in me is wanting to say that the FIA have allowed this to get so bad so they can negotiate a cheaper contract with Pirelli or another supplier but then that would be ridiculous..........
....wouldn't it?