Judt out of curiosity...We had a blow out on a Michelin tyre that had loads of tread left but the side walls perished. Could put my fist through the hole it left.
Was it load rated for your van?
Was it an OEM size kept at the OEM recommended pressure?
Since you don't say you hit a staircase or a pyramid I assume you mean it has blown just out of the blue. That is very unlikely for a top brand tyre of any sort, unless some of the above applies so must have been a production defect.
I know that it is not a a big consolation after having risked your or your dears life, but I would have asked Michelin for a warranty replacement.