This seems like bullshit. It would have been easy to determine ahead of time that Shafer is not a threat to evade arrest, destroy evidence, or harm agents. Based on that, it would have been easy to interrupt Shafer as he headed to his car to drive to work, explain to him his situation, and have him call his wife and ask her to take the children and walk down to the park for an hour. Next time FBI want to harass a citizen like this, they should leave the assault weapons at home.
The public would certainly be safer and happier if there were fewer FBI agents rather than more.