Uhh, I don't want to be Amazon defender, but in US most of the employment is at will. In practical terms, they can fire you for any or no reason at all. There are practicalities that come into play that have to do with unemployment insurance and whatnot, but company policy violation is a defensible 'cause' for firing.
I am not a lawyer nor am I condoning this, but them is the facts.
I am not a lawyer nor am I condoning this, but them is the facts.
edit: added play