The argument continues to be that it would be unrealistic. If you wish to claim that not having a court system, is unrealistic, I can agree with that, and I'd even support a suggestion to implement a court system for major cases. However, the answer is not to introduce even more unrealistic things, two wrongs don't make a right.
The average criminal will have little to no knowledge of the exact procedures a police officer will do, and will often have very wrong ideas about what they can say or do, that's how we got popular common knowledge tropes like "undercover cops always have to say yes if you ask them if you're cops". You usually hire one or more highly trained individuals who spent most of their early life learning laws and regulations to defend you because you can't.
There are some people that take this upon themselves, and even record videos of doing so on youtube, but if you look at the comments, most of the average people seem to disregard them as unusual, because it is just that unusual. However, I believe that if this suggestion were to be implemented, most if not all criminals will be "throwing the book" at cops during arrests, creating yet another unrealistic situation.
In my opinion, the aim of server suggestions it to make the server objectively better, not to serve the interest of your character(s). If the suggestion you're making is self-admittedly unrealistic, but you somehow justify that by using other examples of less than realistic actions, then you should instead seek to correct those wrongs, rather than suggesting more wrongs.