I would suspect that there are plenty of incidents in the LAPD (and every other police force in the country) that could very easily be seen as problematic so there could be some basis for him to report someone for something.I can also see that someone that is seen as all too likely to be pursuing a career in part to be the whistle-blower could be forced out over things that may not normally cause someone to be fired.
That this then cost him every single thing in his life, meant he could never, ever, ever have a wife and family, any career of any kind, and lost him all of his blood relatives and is the one true and only source of all that is wrong in his life and deserving of warfare and all that, is on him as...well if that was the normal result of not making it in the police forces, we wouldn't have any cops left as all the still employed ones would have been killed by the fired ones a long time ago.
I mean sure being a rent-a-cop for a mall or any of the bazillion other things people who didn't make it as cop do may not be the dream he had (and gee so many of them manage to find a spouse and procreate), but this does seem to be all out of proportion to anything they did to him vs what he did to himself (or mental illness or other untreated issues not serious enough to be called a mental illness did to him).
This? is not going to end well.