I fully agree with what they're doing (or at least the principle of it - I haven't examined the details).
With more and more employers, marketers and other people scouring the web to extract personal information about you, this right is an important one. If I decide that I no longer want (say) a facebook page, or myspace, or whatever, I should have every right to delete my account. Same with my Google account, my flickr page and so on.
Maybe my social network site has had a number of security breaches in recent times, or maybe I just don't want my employer to see the photos of my wild party days. Several such sites make it extremely difficult to remove your own page, since they know that the presence of the page might encourage some to "reactivate" their page some time in the future.