Wrong. Its about winning wars.
A combat unit which includes women lacks the focused ferocity which can only exist with equals who can be counted on to pull their own weight. What NFL team would be so foolish as to field a female lineman? A combat unit which includes women is a combat unit headed for a crushing defeat at the hands of a capable and determined enemy.
It's about what people can prove. Why shouldn't someone that has SHOWN that they have all of the physical and mental characteristics necessary be allowed to fight?
Gee, you make it sound like so much fun which women are not being "allowed" to have; sadly, it is no such thing. It is difficult to imagine what would possess a female to exchange what is best about being a woman for what is worst about being a man. But the answer to your question is that women have not "shown" their ability to succeed in ground combat just because a very few of them score well on tests. Placing women in combat units amounts to fielding a third string team, and will get a lot of good people killed.
Go explain to the Israelis that their combat women are destroying unit cohession, they'll laugh you right out of the country.
You are mistaken about the Israelis, perhaps confusing the IDF's training in defensive tactics -- which makes perfect sense in such a tiny nation in danger of being overrun by surrounding enemies. Years ago, the Israelis also thought that human nature had become outdated, and experimented with integrating women into combat units. The Russians also tried it. In both cases, the failure quickly became obvious and the experiments were ended.