I have very low expectations for Apple, so them installing software without the user requesting it doesn’t surprise me.
But I’m mock-horrified that there are users who make two bad choices — first, running Windows, second, running Apple software.
Of course users are a combination of stupid and rationally ignorant and install malware all the time — a primary reason a consumer-friendly software vendor should not make a practice of defaulting users into installing unrequested software.
It’s a short step from installing unrequested software to installing unrequested software that makes your computer less useful, i.e., malware.
Addendum 20080327: Safari 3.1 For Windows Violates Its Own EULA, Vulnerable To Hacks