If you feel you can do better, then create your own mod. I will certainly be willing to check out your product.
With that said, I have first hand knowledge in software development, having worked as an I.T. professional. (MCSA, A+, Network +, and more) Development on the scale of G17's LSPD mod is extremely time consuming, and requires a level of dedication, experience and patience that most people don't even come close to understanding. It's much like having to learn a new language, actually. In fact, it is. There are limitations to the language, and it takes time to learn the ins and outs of the language, but also the workarounds for missing words in the language.
Not only have the developers worked hard to create something for all of us to enjoy, but they've done it in their spare time. They aren't being paid for their work. They have lives. They have families. They have jobs. They have other responsibilities. With all of this, they have created a massive mod, with a ton of features. With this long list of features, comes a danger - the possibility that something won't work quite right. This is where testing has come in. It my professional opinion (I was paid for this, for my professional opinion, education, and experience) that the testing that has gone on in the background that you, and others, are unaware of is significant. Something that is developed that is as robust is LSPDFR 0.3 in the short amount of time that it has been developed in, with an unpaid development team, not backed by a massive company pushing it along a development schedule, is very impressive. The list of issues compared to the list of things working properly is fantastic. These individuals have clearly put in a lot of hard work and dedication, and they have clearly done a great job.
In my opinion, if the only issues you're having is that AI is acting like a fool, I have one suggestion for you - contact Rockstar support. Without Rockstar, the likelyhood of G17 being able to engineer a product (remember, a free product at that) is practically zero, as they would have had to start from the ground up. They're starting with the limitations that Rockstar's programming of GTA V has, and they're doing the best they can to work around them.
Be thankful for what you have. I'm sure the developers don't mind constructive criticism, but to call them out on something that annoys you, and to basically say that what they have, for free, created for people like you to enjoy, and then call their time and work basically as nothing more than garbage, is very inconsiderate of you. I suggest rather than say things such as "I will uninstall this as it makes me mad, makes the game no fun" - you say something positive, and constructive.
In my experience, when people are negative about your hard work, it makes it HARDER to improve it, because it does suck the joy out of a project when you hear such negativity. Be positive, be thankful, and be helpful. Suggest something in a positive way, that doesn't have negative impact on their hard work.
If you can do a better job than G17, then by all means, give them some healthy competition. Otherwise, be nice.