Do I Smell a MSRaT?

Microsoft released an antispyware tool last week. Today, MS released a "Malicious Software Removal Tool" which, interestingly, acronym's down to MSRat. On the one hand, it is encouraging that MS has (finally!) adopted a proactive response to the myriad nasties targeting MS's bug-laden OS and office productivity suite.

On the other hand, does MS's advance into antispyware and antivirus solutions further the MS monoculture in a way that makes systems running MS software ever more, rather than less, susceptible to disabling attack?