The why is not as important as that they know it exists. For, they may truly never look in their own mirror but still can see the wall on the other side and know they can’t cross it. They may argue it is wrong that you put this up and you’re “overacting” but once it’s up make sure your cement is strong. Keep up your boundaries and see that peace and strength is something you can actual build up.
FOOTNOTE- My construction is under way.