This is just my personal opinion , from the druid point of view, I think that There are two diferent things here. you can see that the demons are natural, that doesn't mean they are "good" for nature, They are able to raze a city and some ( extremist ) druids might find this a "pro" nature attitude. But would be the oposite if they are found burn down a forest or trying to bring down the great oak. That doesn't change the fact that the creature still is alive and come from nature itself ( at any place tough , Think that maybe there are druids on the pits as well, The universe is quite extense to think that druids only exist on layo, other pits might have this kind of people as well )
Now on the ritual, I am sure that most druids might frown upon it, Since it going against the nature ( for the action itself , not the creature called ) The pit dweller is still alive and it came from somewhere, he was not "built" or "created", he was transported to this plane.. Again the intent of it being brought to layo is enterly another matter. The creature even if evil is not the problem, the ritual might be
Think on this when you RP this situations. Does this creature exist naturally somewhere, was it created? That would help you to understand the situation there.