Why does it matter? If you buy one with a safety, it is easily removed.

The reason I have one is for reholstering. There have been quite a number of ND's resulting in ventilated legs of LEO's, most of them courtesy of striker fired weapons without safeties. There have been cases of debris, strings, fingers (yes, operator error) causing ND's during reholstering. Videos have shown that people (mostly police officers*) who have perfect finger and muzzle discipline at the range will often violate both disciplines in high stress situations.

* Not because they're the worst offenders, but because they're the people who are most likely to be video'ed during a shootout, so there's a lot of such video out there.

BTW, after I reholster, I don't care if the safety is on or off. The holster becomes my safety. Also, I like it because it operates the same as my 1911.