They could have done the exact same thing in the middle of the day when nobody was home and everybody would be alive today.
They could have waited until daylight and knocked on the door with their warrant and walked right in.
They could have worn body cameras as ATF policy and common sense demands.
"Arms trafficking" is a funny way to say "buying guns legally and reselling them at gun shows" but let's say every single thing said about him is 100% true. If you think someone is a gun runner why wouldn't you take their house when they're not home to get all the evidence without having to worry about what they're doing? Why wouldn't you arrest him at the airport, where he almost certainly isn't armed, and police presence won't raise any alarms?