If they overturn that ticket, it doesn't count to your total. If they show up in court and you don't, they win by default. If you go to court to make sure the ticket sticks, you're in court, and not out writing more tickets. As a police officer, you lose.
You're incentivized to write tickets that "stick."
If you wrote an $80 ticket for a Black janitor in East Palo Alto, they can't afford the ticket, but they *really* can't afford to take a day off of work. And they don't like courthouses...