If Pirelli is to be blamed, it ought to be for not asking to make the change in construction on safety grounds. Had they done so, they would have taken a
PR hit, but they would have been able to make the change without needing to get unanimous approval from the teams.
You can argue that they should make a more durable tire. There were changes to this year's tires, apart from the choice of belt material, and perhaps there is something in the less-stiff sidewall design used this year that makes damage more likely. It ought to be noted that the delamination failures early in the year are different to the failures experienced yesterday. These were punctures, followed by rapid deflation and total disintegration.
You can argue that the FIA ought to change their curb specifications. There are a least 4 profiles I know of and they are quite different from one another. You'll also note that the corners at Silverstone have a variety of different profiles and there are remnants of prior curbing behind some of them. The FIA track inspection procedures may be lax, as well. It has been noted by one major track designer that the FIA will approve curbs that are not exactly in line with their specs, as long as nobody brings it to their direct attention.
Perhaps there is a maintenance issue, as well. The FIA curbs are designed to keep dirt from migrating from behind the curbs to the track surface. If there is erosion behind the curbs, a sharp edge is exposed that may cut a tire, if the driver drives completely over the curb and comes back across it after the apex. Fill in this gap and the problem doesn't exist.
We'll see who gets the blame in the next few days or weeks.
JR