Whoa bud...now you're coming up short-sighted. Just because there are no brookies there doesn't mean it doesn't matter. Introduced species can affect a huge range of the "animal web," so to speak, and saying "ahh, the browns are fine because there are no brook trout there they can hurt" is overlooking all of the other species that browns being there can and will impact. That is fact. Now another fact is that 99% of the natural environments on earth are heavily altered by human activity. There are so many invasives and non-natives spread all over the world that things are really blurred. All of those people that think it is a one-way street (as if Asia also doesn't have invasives from us here in North America) is also so short-sighted.
Now, getting rid of those browns is practically impossible but....