I can’t believe ICE didn’t arrive with all the appropriate paperwork.
Using the term “threat” is inappropriate. He violated the law. Enforcing the law is not a threat. It’s a feature.
It is common in law enforcement cases (with non violent offenders) to ask politely the first time and not waste time getting all the paperwork in order.
It probably works more than 95% of the time.
Knocking down doors gets lots of attention but is relatively rare.
It can also be avoided by keeping an eye on the perp and arresting them once they are away from their home.