Pretty sure, though you'd be forgiven for thinking they were.

[Maybe that wasn't the best thing to start with in trying to clear the air.]

And yes, considering that to even get to the Human World they have to eat the soul of whatever person was unlucky to stumble on the Gate to take possession of their body. They'll just keep eating if left unchecked or worse if they're smart - try to summon something bigger and even more dangerous.

[No exceptions.]