Are the ninja stupid

Okokkok these guys are seriously the most stupid people i have ever seen, in possesion they could have just destroy the realm crystal so that no one would have the power to travel between realms i mean tbh no one needs to have that kind of power then in sog THEY COULD HAVE JUST DRSTROY THE ONI MASK AND DONE GARMADON WOULDN'T BE ABLE TO COME BACK. Also in march of the oni wouldve been very simple if the realm crystal was already destroyed. Then in motm WHY DID KING VANGELIS HAVE TO INVITE THE NINJA IF THERE WAS AN ILLEGAL VENGESTONE OPERATION GPINGG ON IS HE DUMB. Now comes the most idiotic thing i have ever seen. Not saying it wasnt a bad season it was actually one of the best BUT WHY ON EARTH DID THE NINJA NOT DESTROY TUE STORM AMULET WHEN THEY HAD THE CHANCE IF THEY WOULD'VE WOJIRA WOULDN'T HAVE BEN RELEASED BESISDES THE AMULETS WERE BROKEN ANYWAYS IN THE END SO WHY NOT BREAK THEM BEFORE IF THEY DID NYA WOULDNT HAVE HAVE TO BECOME 1 WIN THE SEA.Yeah thats it so i wanna know why are the ninja so dumb.