I actually have a lot of sympathy for Pirelli, they were asked to make tyres that would degrade to help the racing/show - and to do so with a very limited amount of testing. It's hardly surprising that there are issues - and let's not forget the teams always leave no margins (you run the tyres as low as possible) and only had add 3/4 psi to the tyre pressure to stop it happening. (Which is what they did eventually)
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