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Politicians. They tend to frick thins up when they have the Hammer of Goddamn Thor by their side.

Because we are in proxy wars against asymmetric threats that are specially designed to be asymmetric threats by the states who create them.

First, we are allied with states such as Pakistan and Saudi Arabia, where no one faction is really running the show. We are allied with them because they are very unstable, and we are trying to provide enough carrots for the moderating forces to stave off extremist threats from the outside.

What constitutes the "outside" in this context? Attempts to destabilize them primarily emanate from Syria and Iran (and are cynically facilitated by Russia), which has been the case for the past 35 years. Until Iran is defeated in a legitimate war, nothing will ever get truly resolved, and it will be impossible to stabilize the Saudis and the Pakistanis.

Thus, to answer your question, we are still in a struggle because we refuse to go to war with relatively powerful states who nonetheless are in engaged in asymmetric war against us. They take it seriously. We don't. The sooner we wake up to this reality, the better.