Its better to expose problems than live with the false security that none exist. The false security leads to much worse breaches when they happen (see Sony) would be nice if Lulz hacked Sony 3 yrs ago and went public.
...or, you know, be competent in the first place.
I think the only thing they're really proving is what we already know: nearly everyone is vulnerable in one way or another; robust security is tough.
[1] http://twitter.com/#!/EveOnline/status/80732212898697217
Yup, unfortunately this is true, and half-assing it because of this is what gets us onerous new internet legislation.