a whistle won’t stop these goons from harming you.

No it will not, but it will alert everyone around you to ICEs presence so they can have an opportunity to be somewhat prepared.

You’ll at least give your neighbours a chance to put some pants on, hide, barricade, or even arm themselves; before ICE tries to kick in their door.

It also calls others to your aid; quickly forming mob that out numbers ICE, forcing them to focus on crowd control instead of targeted kidnapping.