[lmm]

There will always be ways to evade taxes, but the harder we make it the less tax evasion there will be.

[AnthonyMouse]

You could also say "there will always be crime, but the harder we make it the less there will be."

Technically true but useless for evaluating the cost/benefit of any specific proposal. If the question is, is it worth pervasive mass surveillance, the answer is no.