Yes! we should be concerned about Sectarianism and Dogmatic authority.

The pattern I see is that the first generation is genuine and usually has good ideals or causes that unite them. But then the second and 3rd generation takes over and they don't have that same passion. Their real goal seems to be only maintaining the organization. This is when things take the turn for the worse. Things to be concerned about or watch out for are when groups organize to the point that the organization takes on a life of its own. Like acquiring property, buildings, etc. We also have to know when the season is over and the people in the group need to move on. Reminds me of

Ecclesiastes 3:1 For everything there is a stated time, and a season for every event under the heavens:

John 3:8 The blast is blowing where it wills, and the sound of it you are hearing, but you are not aware whence it is coming and where it is going. Thus is everyone who is begotten by the water and the spirit."