A country's defense expenses are for its own benefit providing easy global market access for its companies, leverage, favorable terms and markets for arms for its own defense industry. All these benefit the US and its citizens.
There is a well documented history of military intervention under pretexts driven by business interests going back centuries with the latest being Venezuela. A country is being openly destabilized, millions will suffer, there will be increased immigration leading to more right wing extremism against immigrants, and more business opportunities for US companies with access to the largest deposits of oil in the world. How does this help global security, this seems to transparently benefit US interests at the cost of everyone else. [1]