They are God's servants whether they choose to be or not, He raises them up, He brings them down
There is a difference between serving God and "committing a life to the service of Jesus Christ and America's freedoms".
Jesus didn't address the political/civil bondage the people of Israel suffered under when He came the first time, it wasn't on his radar. Scripture informs me that He shared our humanity in order to "destroy him who holds the power of death--that is, the devil-- and free those who all their lives were held in slavery by their fear of death.
That's the freedom I believe I'm called to spend my life extending to others. The myriad of people who fear the death of "little slices" that satan inflicts on them every day - destroying their lives bit by bit. The word destroy in the passage from Hebrews 2 above means "render ineffective". I want to spend my life of service to Jesus by, in what ever small measure He can use me, rendering the activity of spiritual darkness in the lives of others ineffective
This isn't to say that I'm not to make political judgements and decisions to try to preserve the physical freedoms we enjoy here. They are worth fighting for because they are a better (easier physically, not more righteous)crucible to operate out of than, say, China or Iran.
God has blessed us. He also blessed Israel on the OT. Their call wasn't to protect their blessings. Jesus rebuked them because maintaining the "purity" of their cultural and religious institutions became their god.