It's not so much a matter of enmity (or lack thereof) as it is a matter of capability (or lack thereof). China and Russia are capable of causing serious harm to U.S. citizens and interests. Ecuador, not so much.
Of course, this view does not account for black swans, but I think the possibility of an entirely unprecedented method for a militarily and economically inferior nation to meaningfully harm U.S. citizens and/or interests being developed and put to use (not even accounting for alliances or motives) is sufficiently low that the risk is not worth surveilling the world to mitigate.
Of course, this view does not account for black swans, but I think the possibility of an entirely unprecedented method for a militarily and economically inferior nation to meaningfully harm U.S. citizens and/or interests being developed and put to use (not even accounting for alliances or motives) is sufficiently low that the risk is not worth surveilling the world to mitigate.