It is a completely made up number. If your argument against increased surveillance is based on its ineffectiveness, then there has to be a level of effectiveness where you would agree that that it's acceptable.
> If your argument against increased surveillance is based on its ineffectiveness, then there has to be a level of effectiveness where you would agree that that it's acceptable.
Not necessarily. Someone could be try to persuade by offering an argument that he thinks will be appeal to some, but does not represent his full thinking on the subject (e.g. he could also have moral reasons for opposing increased surveillance).
