I highlighted in my thread that the reason why people are inclined to side with the Tieflings is because of how the start always paints the Goblins as "bad" seeing you don't have a choice to fight with them at the Druid's Grove. If people are given a choice to fight with the Goblins and experience the other side of the story, they may then be more inclined to take out the Druids. Remember that there are various ways the Grove can be ambushed and currently it seems the story is forced to go via the main gate interaction.
In my Halfling playthrough after the Tieflings took out the Druids, I systematically murdered each of the remaining Tieflings. I then decided to head towards the Goblin camp to inform Minthara of my actions and was hoping for a different reaction or reward of sorts. The same cutscene then proceed to happen where she gets annoyed at the Goblin with the poor scouting and asking me about the torture or if I know what happened. Was REALLY hoping for a "I took them all out myself for the Absolute" option which would be super awesome. Of course it was not meant to be and she then proceeded to do the whole, Lets go we found the place. Only way to proceed from then on is to take a Long Rest which then gives an update on the Quest that the "Goblins got to the Grove before you can do anything". Bummed out cause, you know, I was the one that did all the killing lol.
It's linked as well on how the map is made. And it's a narrative flaw I think. Because your character has to see the gate scene, where goblins attack the grove, before meeting goblins in the blighted village. You can't even escape it in stealth. It's just thrown at your face because there is no other way to get higher in the map than by this route.
There should be a way to avoid the gate fight altogether and meet the goblins first.
Totally agree with you hence why I recommended the alternate choices to resolve this problem. That encounter can still happen but you are given a choice to either side with either party or watch. Assuming watch we can assume the Goblins lose (realistically you're a scouting party that chanced on a Druid Grove) and then a simple check to convince them to let you in or not.