Well there are two ways of looking at this…
Firstly, since Bruce Willis, in his 20-odd year enlarged career has tried to save the humanity from aliens, to monsters, to villains and what not… so instinctively he feels obliged to save the humanity from yet another catastrophe - the Spears-Lohan-Hilton trio who are out on an anti-panty-bare-all spree.

Secondly, may be the oldie feels that recent kidos have swept more news-worthy idols like himself under the rug… and worse being stamped upon …

He said,

“They’re not writing about guys my age much anymore, unless I do something naughty. They’re writing about the kids. That’s what drives pop culture now. Anything goes, to the point where it’s OK for young pop stars or film stars to show photos of their naked vaginas in a magazine. If this is it then it’s over man, it’s the fucking fall of Rome.�

Oh c’mon folks from the media… give him a column space too he need not bare all for that…