An Allegory
There are many people living in a large house. Outside the house, a pack of rabid wolves circles. They want in. Most of the people in the house know better than to let the wolves in. They in fact work to secure doors and windows against the threat of the wolves. However, for some bizarre reason, some of the people in the house leave doors ajar. A few even invite the wolves inside.
Now there are rabid wolves in the house, and it’s everyone’s problem.
Rabid wolves need to be put down.
People who encourage them to come inside should lose any position or privilege that allows them to decide who has access to the house.