But they clearly are multiplying massively. I can quote any number of Swedish language sources that back up that statement, but that wouldn't be of general interest to the HN community. I'll happily concede that we disagree on semantics.
In which case, as I explained, there is probably a comparatively easy solution involving reinforcing the naturally preexisting factors which usually limit the population growth. In any case, there is no reasonable way in which the situation of wild boars in America and Sweden could be described as “the same”. They are fundamentally wildly different.