It sounds like excuses from Pirelli. A team will not run a tire underinflated, that causes heating and wear issues. The correct inflation depends upon weight of car, Temp of the track, and side corner loading on the tires. If you don't have your pressure right for the conditions, you won't be competitive. There is not one magic pressure for all cars and conditions. As for the curbs, I saw close up video of them. They were no worse than other tracks which have not had extreme blow-outs happen. Don't get me wrong, the curbs were not perfect, but they were not bad enough to cause the number of failures seen.