Sort of bad faith arguments but i'll defend the points regardless.
1. We do but the Majority of whiners bring issues we've already addressed; arguments we've dismantled hundreds of times, or just straight up bad ideas/suggestions with no thought or consideration to basic gameplay balance.
2. While the justice system is sometimes slow and can possibly be improved in the future, it still currently works fine, as I am writing this there are ~10 open DA tickets and 8 open criminal cases (overlap). This actually isn't that high as it used to be as a majority of charges will result in plea deals (as is what happens in real life) and you have to consider that a lot of cases remain open because the defendants effectively refuse to co-operate or take the legal RP seriously, they view it as a dark rp type arrest where they get put in jail for 2 minutes and are then instantly released. This is a different gamemode with a more functional real world justice system. Don't want to waste the time? Don't do the crime, or just accept the plea. Majority of them are under 45 years anyways. Get a lawyer, you're probably an idiot on your own.
That being said, as @MxR mentioned, getting caught is sort of a skill issue and if they have enough evidence to charge you with 45+ years then it's really a 'don't get caught' problem. People get pk'ed this is the reality of Mafia RP and your first PK is likely always something stupid or avoidable, none of that FiveM 'consensual PK' bullshit. Actions have consequences.
3. There's already a good amount of legal ways to make money, such as; taxi services, delivery trucks, working jobs for factions and their events, collecting oil, collecting scrap from trash cans and any other LEGAL hustle you can invent in your brain (it is an RP server after all, you have to be inventive). Adding more profitable venues to legal RP does nothing to enhance the RP of a MAFIA RP server, as mentioned by @Demigod the game will always reward high risk actions like gun running or drug selling since you can be arrested for it. It simply sounds like all you have done is wait on shipments instead of using the tools we've given you to produce your own RP. It's not only about money !
4. This is something we've already considered as a concept, mind you slightly altered, and are looking into it. Time will tell.
As for the last paragraph you wrote:
I consider this to be a bad faith argument. Saying only the old heads are sticking around is just wrong. The nature of a game server is that people filter in and out and usually you mark a 10 to 20% retention rate when popular. New players that enjoy the game stick around, like yourself, you joined for the first time in early May and more than 3 weeks later you're still around. Diverge has been open since December of 2020, that is more than three years of straight operation. Players will play for a few months, disappear for a year, then come back again. This 'glory' has lasted that long and will continue to last as long as we put the effort and time into it. Basically, your paragraph implies that us not immediately accepting your suggestions as pure truth of reality would lead to the server dying, which obviously isn't the case.