So Angels have ALWAYS BEEN THERE.
Demons HAVE ALWAYS BEEN ON EARTH.
Yet at the beginning Sam and Dean didn't know how to kill a demon.
And neither did their dad. Much later they got the knife. But isn't there an oral tradition with hunting.
Does it not bug anyone else that there has NEVER been a problem with angels before Sam and Dean?
Shouldn't all hunters know how to kill a demon and an angel from the getgo?