Unfortunately cards get hacked and sites get hacked all the time. As far as I know I haven't had fraudulent charges recently. Since it happens so often I'm not sure that the recent rash of hacking can be attributed to KP. With all the Christmas shopping at the time KP was hacked I think it could just well be any popular site.
I'm pretty sure I use Paypal most of the time. I won't stop shopping there just because of this incident.