It's easy to criticise Maldo, but if this one incident was the straw that broke the camel's back, it would be a bit ridiculous.
I think he's very petulant, and it would not surprise me at all if he was still angry about "getting run off the road" at Valencia, but this was not a particularly dangerous or reckless mistake. It was simply a mistake. Perez seemed to have a strong prior opinion which really influenced his reaction to this incident and tbh that really undermined his statement in my opinion, but with Maldonado's history in the sport, including his daddy undoing a lifetime ban from monaco with his cheque book, he was probably not the most welcome name on the grid when he bought his seat in f1.