You have to draw the line somewhere. Would you keep your "loved" murderous child in the house? Or even just 1 who keeps "sinning" over and over and over again? IOW, he's taking advantage of you and is learning nothing. Flouting and mocking you. That's not love worth returning, either.
These people are doing right by standing up to sin, if you will, and calling some1 to account.
Sounds like you pick the punishment based on who the sinner is vs giving them the chance to repent. By your reasoning confession would be a one shot deal where if you sin again you are ex-communicated. Where is this sinner-free church you attend?