Also sometimes they switch completely, personally if someone wants to improve, if only a little I try to encourage it. If immediately they're met with hostility for improving then the only sensible direction for them to go is back. At the end of the day and as you pointed out in your comment, it's a numbers game. You can try to divide and conquer and also recruit. Defectors / converts are extremely useful at convincing more to convert which definitely won't happen if at the front door we're telling them to fuck off and suck a bag of dicks. So if people go against their poor judgements I'm all for it, one step closer to waking up, switching sides and adding to the numbers.