I suspect that what you're intending to assert is the possibility that lower crime and higher police survival rates are due to the access the police have to bet

I suspect that what you're intending to assert is the possibility that lower crime and higher police survival rates are due to the access the police have to better, "military-style" weapons, and you're accusing the author of missing that possibility. But that's not what the thesis of the sentence you quoted above is. The thesis is "it is odd that the relationship between police and the public on the whole is growing increasingly antagonistic." For that relationship to be casual, that would mean that lower crime and higher police survival rates are due to the practice of responding to illegal poker games among retirees at the Elks Lodge with the same degree of force as they'd use to take down an international drug cartel.