A running gag in The Dresden Files is how magical happenings will get explained away.
Building destroyed? Terrorists.
People killed by a werewolf? wild animals
Someone sets a car on fire and kills someone? Gang activity.
At one point someone is filmed shooting a giant werewolf, but the video quality sucks because it takes place in a poorly lit area at night.
Everyone assumes the video is some special effects stunt.
The rule of thumb is that things with magical abilities attain positions of power and influence in our society, then use that to cover their tracks.