Managing Virtual Machine Security

Virtual Machine Security:
Firstly, why do we need to turn off memory optimisation to get a Virtual Machine Image snapshot? Surely people want both.

Secondly, Parallels sell Version 8 bundled with Kaspersky for Mac but that only protects the Mac OS X environment.
Surely it should be protection for both the Virtual Machine OS (say Windows 7 or 8) and Mac OS X.
Perhaps they could negotiate with Kaspersky so it works with the same download of malware data used for both?
Surely people want & need both environments protected too.