Unfortunately, it is difficult to defend a public site 24/7 against a determined assailant, but there is no point in making it easy for them?
Difficult, yes.. it's even annoying. TheSpec obviously doesn't have that much time on his hand thus he is "determined".. but yeah, don't make it easy for him. There are moderators who can ban and users who can use the AP system to self-moderate.. just don't abuse it.