Because until that understanding is widespread, every solution we try will only concede more to the Jihadis. And as they gain concessions, they gain advantage. They don't concede anything back. It's all loss on freedom's side and gain on Shari'a's side. They take the concessions and push for more, and the West still keeps conceding, thinking they're dealing with people who have a sense of fairness and reciprocity.
The simple solution is "no more concessions for Islam." If every democratic country stopped right now conceding anything to Islam, the problem is mostly solved, and what's left of the problem would be isolated and manageable. But until a majority of the population of a country really understands the problem, no politician in that country can afford to take that stand.
What this means is that YOU are a crucial warrior in this fight. You, the citizen warrior. You have your circle of influence, and it is critical that you do all the influencing you can.