By "refused to participate in a joint effort to safeguard those patents for all", do you mean that Microsoft offered to buy these patents jointly with Google, in such a way that Microsoft would be able to use them to extort Android manufacturers and Google wouldn't be able to use the patents to help defend them?

Because if so that's some pretty heavy spin you're putting on it.

edit: excerpt from Google's official response, linked elsewhere in this thread (note it was in reference to a different bundle of patents).

" If you think about it, it's obvious why we turned down Microsoft’s offer. Microsoft's objective has been to keep from Google and Android device-makers any patents that might be used to defend against their attacks. A joint acquisition of the Novell patents that gave all parties a license would have eliminated any protection these patents could offer to Android against attacks from Microsoft and its bidding partners. Making sure that we would be unable to assert these patents to defend Android — and having us pay for the privilege — must have seemed like an ingenious strategy to them. We didn't fall for it.

Ultimately, the U.S. Department of Justice intervened, forcing Microsoft to sell the patents it bought and demanding that the winning group (Microsoft, Oracle, Apple, EMC) give a license to the open-source community, changes the DoJ said were “necessary to protect competition and innovation in the open source software community.” This only reaffirms our point: Our competitors are waging a patent war on Android and working together to keep us from getting patents that would help balance the scales."