It's odd, but there's a lot of people who are blind to magic, or their brains won't accept it... their subconscious edits their memories of the event to fit their view of the world.

[ Ilsa shrugs again. ] Most of the time, it's actually a blessing. Luck, good or bad, gets blamed and they go on with their lives intact.

It's when one of the horrors is in their face that they remember, if they survive.