I agree about the fact it costs money to do this. But doing it after the fact is the worst way to do it - it is the most expensive way and also least effective

I agree about the fact it costs money to do this. But doing it after the fact is the worst way to do it - it is the most expensive way and also least effective in terms of preventing runs. So as long as we are going to pay for it anyway, let's at least get the most benefit, which would also, in a happy coincidence, be the least expensive.