........ I don't agree with that. Although what you mentioned may be taking place, this does not mean that we should not bother about eating halal or that eating halal is insignificant.
Remember the emphasis was on "trace elements". No one says you go out and eat a pound of lard. In fact many in the middle class Europeans have moved away from that stuff anyways (for health reasons).
So yes "eat" halal but do not go around looking for 0.0001 parts per billionth trace of pig. You will make your life very very miserable.