It seems like you don't agree with coordinated releases as a standard. That's fine, but irrelevant here. If you agree to coordinate, so that you can get inside info on security updates and be prepared, and then break that agreement, you're not trustworthy. No hand wavy reasons will change this fact.
I don't know many who want to deal with untrustworthy people.
I don't know many who want to deal with untrustworthy people.