Reptile....
Interesting question, although it does sound as though your suggestion was made without any basis in fact.
Why not check yourself?
1. Find the % of accidents caused when PIC was military trained.
2. Find the % of ex-military pilots employed as civil pilots by those companies at the time.
3. Establish whether they were more or less prone to accidents than their civil-trained colleagues.
4. See if the percentages change over the decades.
If so, make reasoned suggestions as to why the changes have , or have not, taken place.
Given that you state that you are from California, you may consider concentrating on the US or widen the scope of your study to include other ICAO states.
Should you be able to gather such data it would be of great interest.
I suspect that you will not do so.