Because there's no answer to it. It's as clear as day to what the ramifications are (at least from my basic understanding). It would only be considered if Arabs are running around the streets of yerushalayim killing people and the army can't contain it. Only then will there be a discussion to have.
1) Whether Arabs are running around Yerushalayim or shooting rockets from other countries, the danger is real and present and soldiers are needed.
2) If the concern is learning, there are plenty of able-bodied young men who aren't learning.
3) If the concern is Yiddishe values, there are plenty of frum soldiers who stay frum in the army.
Saying there is no answer or solution is simply not true. You can say it is a daunting task. You can say you don't know how it will be accomplished. But they aren't even trying.