MANY REASONS - 1ST ANGELS AND DEMONS ARE SPIRITS

2NDSOME CAN SHAPESHIFT - AND LOOK LIKE HUMANS - AND THEN BEFORE YOUR EYES JUST DISAPPEAR!

3RD THEY ARE TELEPATHIC & CAN ALTER MEMORIES! - YOU DID SEE THEM! - BUT THEY MADE YOU FORGET & THINK YOU DID NOT.

ALSO WHY WOULD THEY SHOW THEMSELVES? - AS PERHAPS A LOWER FORM?

TO BE DESTROYED BY HUMANS - WHAT HAS HISTORY BEFORE HUMANS  TAUGHT THEM?

SOME COMMUNICATE VIA TELEPATHY & THERE MIND ALTERING ABILITY

ALTERING THE HUMANS REALITY OF WHAT HAS JUST HAPPENED AND PERHAPS MUCH MORE...  ???