Earlier quoted context omitted.
It gives me pause when an obvious action is actively rejected for decades, but still is asserted as a "simple" solution. It might be the _right_ solution, but if it failed to be adopted for so long it can't be that simple, isn't it ?
In this case, it really is simple. It's just the opposition is vehement.
They are an active party, so you can’t just say “it works, but only if these people don’t exist”. This means the “simple” solution only applies to an imaginary world, and an actual solution requires a lot more thought and adjustment to accommodate for the reality of the problem.