I cannot speak for them but maybe, just maybe, some Christians respect the rights and liberty of others; the very things that define this nation and make it great?
The question is an interesting one. I base some of my beliefs on how the government should act on LDS scripture.
D&C 134
2. We believe that no government can exist in peace, except such laws are framed and held inviolate as will secure to each individual the free exercise of conscience, the right and control of property, and the protection of life.
So, which is more important - the protection of life or the free exercise of conscience? If it's a religious question, then I have to keep this scripture in mind.
9 We do not believe it just to mingle religious influence with civil government, whereby one religious society is fostered and another proscribed in its spiritual privileges, and the individual rights of its members, as citizens, denied.