It is pretty obvious that he was already pushed to the limit with stress, which in turn indicates that this part of the French police need more psychological support be made available to them.
This is pretty common in larger police departments in the US, so much so that some keep a psychologist on staff who specializes in cop problems.
When they were first introduced there were some glitches, such as leadership assuming that any officer who approached the counselor was a problem and needed to be put behind a desk.
But everybody quickly figured out that psychologists were a big help in reducing non-critical stress, and also when some cops had been pushed to their limits, often by a combination of work and home stress. And this ended up saving a lot of lives, both of the cops themselves, and the people they had to work with.
Chaplains have shown better than psychologists.