One, we don't know if they're telling the truth. Two they never respected or benefit from Sikhi. Three we only want committed people. I'm not saying we don't retain all good Sikhs and prevent them being just converted or lead astray. But..when it comes to certain things...you only want certain people. While we have great growth potential...only so many people going to be worthy and interested.
Forgive the poor parallel, but many gangs thrive, or thrived at certain sizes. Where quality, trust, and loyalty are maintained. Many have found that numbers aren't necessarily growth.
Like if you were crippin would you want everyone in? Or as many real ones as possible? So when I come across someone like this supposedly leaving? No worries.
Conversion, grooming, things like this are different.