Not for any 'good' reason, given how they are not allergic to other utterly insane examples of state propaganda (constant glorification of the military, the executive, childhood recitation of the pledge of allegiance).

The only reason for why there isn't a CBC equivalent in the US is 'because it happened that way'. Trying to find some generalized reason in this particular artifact of a political culture is like trying to find reason in a drunkard's walk.