Doesn't that make them look even more amateurish and incompetent? They chose an insecure content management system and, most importantly, they didn't isolate it enough. So penetrating that resulted in a complete penetration of their site.
If they were selling hand-made baskets, nobody would blame them, but they sell "security" and charge big bucks for it, so they deserve the ridicule.
It is an interesting perspective I guess on selling "security", both as a service and a product. One can charge lots of money, but unless there is a serious attack and penetration, it is hard to know what the quality of they security product is. Of course once the penetration happened, there is at best pity and at worst ridicule and blame.