How about "the world isn't perfect and whilst it would be great to live up to our every ideal, our primary responsibility is running a business and providing a great experience for our users who, ultimately, in the vast majority regularly engage in such egregious violations of sensible security protocol that most-anything we do is unlikely to affect them and in cases where it would, said users are usually sufficiently literate to wish to avoid this anyway".

That's a pretty long-winded explication of, "it's a race to the bottom."

It's a pretty long-winded explanation of "the world ain't perfect". :P