My take on it is that Larian most likely planned for the party to have some of its members leave the group depending on the path you choose (just like one particular member in early access). The way to trigger that is to force wildly antithetical characters to collaborate, therefore there will always be some of them that will look like total jerk and you are forced to take sides. It probably will makes more sense when we will get the bigger picture, aka BG3 release.
