swinokur - I will cite to the encyclopedia of common sense. Semi-automatic pistols have been existence since the 1890's. Until Glock introduced the G17 in the 1980's, virtually every major manufacturer of semi-automatic pistols in the world (ie., Mauser, Luger, Browning, Colt, Walther, Smith & Wesson) designed their pistols with a positive manual safety of some type. Many of the designs incorporated both conventional manual safeties and grip safeties. Many of those designs are still inexistence today. It does not take a giant leap of logic to say that there are many more pistols with manual safeties than without. It should be noted that unlike Glock with essentially one cookie-cutter design, many of those manufacturers had multiple models with different designs, all of which incorporated manual safeties.
Incidently, I consider the XD to much safer than a Glock because at least it has a positive safety that reduces the risk of inadvertent discharge.