Microsoft Using Scare Tactics For Google Browser Extension?

Update: Not long after MIcrosoft talked about Google making IE less secure with its Chrome Frame plug-in, Google came out and

The spokesperson added that accessing sites with Chrome Frame brings the Chrome browser's sandboxing and malware protection features to IE users.

Original Article: This week over a year), but it has already made a fair impression on the market. Microsoft still largely dominates this market though, and the company doesn't appear to be too thrilled with the concept of Google penetrating it right from within, via a plug-in.

Microsoft

https://www.youtube.com/watch?v=sjW0Bchdj-w
Ars notes that Microsoft has a point in that plug-ins can create security issues because they typically remain unpatched longer than the browsers themselves, but the company is probably off the mark with regards to Google's Chrome Frame in particular.

"As for IE + Google Chrome Frame potentially allowing for double the damage because the browser mutant would be open to a wider range of attacks, we're going to have to call foul,"
Given that Microsoft has the much larger market share, malware distributors have more of a reason to go after IE rather than Chrome. Furthermore, Microsoft mentioned security issues with "Chrome in particular" and after patching some initial holes after Chrome was first launch, the browser has maintained levels of security where other browsers (including IE) have failed.

Is Microsoft really concerned about the security of its users in this case, or is it just trying to dissuade people from using a competitor's plug-in? If the latter is the case, perhaps they should get in gear and support the latest technologies. Browsers are one market where Microsoft still dominates over Google. They don't want to lose that share.