I think W-A canceling at the last minute is a sign for concernn with his brother's condition. Unfortunate that CP Maxima had to endure negative outbursts by herself, as I'm sure having W-A by her side would have have that easier, I suppose
I read elsewhere that the outburst in Paris was directed at an unpopular politican who happened to enter the concert hall at the same time as Maxima - an unfortunate coincidence indeed!