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@jimlynch: the fact that you think Macs don't require antivirus is really, really scary.
Macs and Linux are only safer than Windows because most virus writers don't bother with such a small portion of the population.
Because people are not installing antivirus apps on their Macs, means that on the occasion that someone writes a virus for them, it spreads like wildfire.
You might really want to reconsider your position.
I think it is both - Flash is buggy software, and they ARE trying to push McAfee Security Scan. I find it borderline dishonest that they are making the default to install McAfee. Frankly, I consider McAfee Security Scan pretty much malware too, as the only thing it does is to push McAfee products, and by making it default install the companies are clearly ok with the fact that many people who install it don't actually want it. The thing is this isn't new - Adobe and McAfee have been working together to install unwanted software for years. Here is a guardian article from 2010 warning people about the same thing.