Hi TheSpirit,
A bit harshly put here and as a generational remark, I would like to go about these issues a little bit more subtle, factual and into detail. But on the other hand it is true that sometimes a security issue is turned into a beneficial feature, MS has used these tactics before. That all sort of software can do things to the browser makes an integrated browser a particular vulnerability in case it is "broken". It is patched now, but how many months do we have to wait until another skeleton is coming out of the MS coding closet, with closed software you never know, and it is/was not only MS that had these issues, other software have shown similar issues, like ZoneAlarm, and a couple of more examples.
So you can state that open software is far more buggy and full of holes, because everyone is validating the code, look over your shoulder and where the one person can code the other can uncode. In closed software you never have an idea what "ghost coders" in the past have done participating in the software's development,
polonus