For the most part I agree with you (I hate bloat as much as the next guy).
As I understand it mtgox sent a transaction with an obviously invalid protocol message.
It's not about bloat, actually. The point is, it was
not an invalid protocol message. This was perfectly allowed by the protocol. There is no reason to disallow things that look strange but are valid by the protocol, just because it looks "obviously wrong" to us.
If someone screws up with bitcoin and sends 2 million coins into the darkness, that affects us all. That can only happen so many times before bitcoin is no longer worth anything to anyone in its current form.
Yes, it does affect us all. In fact, it makes the bitcoin you are holding
worth more, not less.