Right. The thing is, web browsers are always going to have to deal with two kinds of people: The malicious and the incompetent. They both write web pages, and

Right. The thing is, web browsers are always going to have to deal with two kinds of people: The malicious and the incompetent. They both write web pages, and neither can be avoided completely. And, when you get down to it, it's impossible to distinguish sufficiently advanced incompetence from malice. (This sentiment seems quite appropriate when discussing Microsoft's browsers.)