I had a look at their site and went through some of the posts and topics to, get some sort of idea what they're all about.
The general feeling i got was they hack to expose weaknesses in the website securuity
When they find an exploit they run into a dilemma
Do they inform the webmaster ?
If they do ,they risk that webmaster saying 'you used illegality on my website ,so i'm going to inform the police and your fu**ed
Or 'Thanks for showing me these security flaws' ,I'll get right on it guvnor
Seems the larger the sit, the higher risk of legal action threats from the webmasters
With smaller more personal sites ,its more likely you'll say ,thanks and sort the flaws out
So the defacement is their only other option they can use to expose these flaws to the site owners.
Or they can leave them and let the Russian Gangsters out there inform the webmasters.In their own unique way :shock: