I'm confused. Why would the government want to break Chrome? Also, if they are not going to release the exploit soon (especially to Google), why are you saying 'safer software for all'?
Safer software for all, because it's a better thing that VUPEN discover the bug than if it's discovered by some criminals who keep it secret and scam/hack
I suppose it depends on the point of view, but having it exclusively in the hands of governments can easily mean it's limited to criminals who keep it secret and hack.
Why would a entity as big as "the government" would invest in breaking one browser used by a minority (~10%) of users in the web? Wouldn't it be much easier to just compromise their Internet connections?