But with an abundance of caution, would you allow anyone who wrote/spoke/sung about such things to be a screener? Just imagine if something *did* happen, and it was shown the employer knew all about it before.

That's just a very bad ground for the employer to be on, particularly given that I'm sure many other people would be just as suited for the job and Khalaf would probably find some other job anyway. Tucker probably didn't forget about the freedom to express yourself, and it sounds like he didn't also forget the freedom of employers to exercise judgment, particularly when their own livelihood and reputation could be on the line.