"IF" its true (which I don't think it is), then what's wrong with non-lethal removal? Just because they are not a threat to humans or the majority of animals in the area does not mean that they should be there at any level. Even the most intelligent people can not predict all impacts invasive species can have.
That being said- lethal removal would be unacceptable unless there is a serious impact they would be causing (once again, i doubt it)