I'm confused, can you please explain that in a vaguely non-mathematical way?

The more I think about this the more I realise that our best bet would be to have an almost tied vote every day between two different people so that at any given point we can go back and change to lynch someone that we suspect. That is to say at the end of day 2 we will have 4 people who are able to be killed at short notice, at the end of day 3 we have 6 people, etc, etc. This would mean that the degree of certainty that we need to lynch someone who is scum would be lower, as we can just make any real suspects one of these two people.