Not sure how you are confused.. when you make something illegal that is used to save your life when someone is trying to kill you with a knife, it isnt a win that you eliminated gun deaths and replaced them with being killed by other means.
Much as when making vaccines illegal you effectively will eliminate all deaths via vaccine, but now replace those deaths with even more deaths from the virus itself.
Same thing, not sure why that concept would confuse you.
inb4 be sure if you use numbers you compare netherlands to itself both before and after a change. Any other comparison would be dishonest due to confounding.