This is how vulnerability research is supposed to work.
Vulnerabilities are found, fixed, then published. The entire security community is able to learn from the research, and -- more important -- everyone is more secure as a result of the work.
The FBI is doing the exact opposite. It has been given whatever vulnerability it used to get into the San Bernardino phone in secret, and it is keeping it secret. All of our iPhones remain vulnerable to this exploit. This includes the iPhones used by elected officials and federal workers and the phones used by people who protect our nation's critical infrastructure and carry out other law enforcement duties, including lots of FBI agents.
This is the trade-off we have to consider: Do we prioritize security over surveillance, or do we sacrifice security for surveillance?
