Comment by kopecs
I think this is discussed at length in part II.D (starts at the bottom of 17). I would write more but I have spent too long already on this thread :)
I would be a bit careful about trying to liken motivation for something like an EO to a law though; many members of congress voted to pass the exact language in the final bill, and they might not all have agreed with _why_. So I would put to you that the text itself is the primary thing one should consider, especially more in the legislative case than the executive one.