My example appears to have distracted you from the point I was making. Let me make the point again without an example: being vulnerable to one attack does not mean there's no value in not being vulnerable to another attack when the attacks require different strategies and levels of effort. Or again: making breeching security more difficult does in fact reduce your risk of random security breeches. Or to put it another way, a determined attacker will search for an opening, an opportunistic attacker will move on. There's value in protecting yourself from opportunistic attacks.