Not trying

You’d think that if the US authorities were putting a really vital Mob witness in front of a Grand Jury, then the bozos would do it in the interior of a building so that some bum of a sniper couldn’t shoot through a window and take out the vital squealer.
    But then you wouldn’t have an essential part of the plot of the film.
    But if there’s a bad guy on the inside, he could plant a bomb in the meeting room. Which would be more spectacular but more costly to film.