Why are people so invested in ICE being able to wear masks?

I get the push against ICE wearing masks. I understand both the public facing reason and the probable behind closed doors reason why DHS likes ICE wearing masks. But I really don't get why the "man on the street" seems so excited about ICE wearing masks.

-Edit. To be REAL clear, I get why the “man on the street” would be really invested in unmasking ICE for all the reasons people have mentioned. What I don’t understand is why the pro mask camp is so excited FOR ICE to go masked.