You keep mentioning dirty play, can you define what dirty play is in martial arts? While you are at it, define what your goal is in learning martial arts?
The reason I ask is that although I am happy not to have to use martial arts to resolve a situation, if a person attacks me despite my attempts not to engage in fighting, I don't have a lot of sympathy for what happens to them. From the little I have seen of Krav Maga, the practitioners don't have a lot of sympathy either. Am I wrong?
Some of your other comments, I will just put them down to inexperience and lack of knowledge. But ...
Most all military and police taking Krav Maga? That has already been commented on, but I will clarify that military combat and police work are each difference from what most people engage in, and so what the responses should be. The last thing that most military units want is for their soldiers to have to engage in hand to hand combat. So knowing a few specialized things for when that happens will probably suffice. Some specialized units may need training for that, but it will likely be a conglomeration of effective techniques. Police have the added constraint of trying not to maim or kill while having to fight with someone. Therefor they may not be able to use some tactics the military may use.
Going for weak points? What martial art would prefer to go after strong points? That doesn't make any sense.
Not being able to use full strength? Yeah, if you constantly attack weak points of the body while connecting with great strength, you will eventually run out of practice partners. I would suggest what used to be taught in the TKD I studied years ago. Learn control. Learn to put full strength at a point you want. That takes time by the way. You want to be able to put full strength about 3/8 inch from what you want to strike or kick. You have to start out and work you way in. Consider that if you have that kind of control, in a real situation, you can put your point of contact 1/2 to 1 inch inside the attackers body. If you can't do that, give up martial arts.
My personal recommendation at your point in martial arts would be to take one martial art, and get really good at it. After that, you can look around again and see if there is another art you would like to pursue for whatever reason. By the way, getting good doesn't really occur until around whatever equivalent your art designates as around 2nd or 3rd dan. You don't have to learn 10 martial arts to 10th dan before you become proficient in defending yourself.