This kind of callousness and careerism happens with anybody who starts working in the industry of putting people in jail. They have to succeed in their organizations.
Because definitely a great way to ensure the best people are handling the difficult task of prosecuting criminals is to cast aspersions on everyone who's ever done that job.
I made that statement because the incentive structures & cultures of these organizations make it you have to behave this way on some level or get weeded out. It wont apply to everyone of course, but the overall trend points to it.
It's up to the people who hold the knobs on the incentives to make the changes they want to see.