You're right, I have a jaundiced view of Thai police; I hate bullies and believe you can judge a country by its police force.
I was waiting at a U-turn when two tearaways without helmets/license ran into me at 90kph. The scruffy cop who shambled round 15 minutes later decreed I was at fault as I had emerged from a minor road to cross Sukhumvit. His report, all in Thai, showed my vehicle jutting out into the main road. I refused to sign it. My insurance agent said if I didn't the casualties would not get class 1 hospital treatment, so I signed. (He was later replaced.) After months of mental turmoil I paid out over 100K for lawyers and victims; (on a frozen UK pension.) There have been two other incidents where police have used their 'discretion' in dealing with family incidents.
I live here because my son owns a restaurant in Bangkok. I am generally happy with my life. As a professional writer I enjoy composing. Every one accepts Thai police are bent on an almost daily basis. Unless people (like the Taiwanese actress) make a fuss, nothing will change.
Presumably you have no problem with corruption?