Understanding

Joshua 22 is a very crazy chapter, but I think it is something that plays out often.

The Israelites have pretty much taken all the land that they set out to take, so they send home the 3 tribes from over the Jordan, who fought faithfully with them as they had promised.
On their was home they build an 'imposing altar' by the Jordan.
This completely freaks the rest of Israel out and they prepare to go to war against these 3 tribes.
Wow, they were fighting side by side for weeks, months before and now they build an altar and they aren't friends anymore?
Luckily, before they head to war, they send a group to talk to the 'rebelling' tribes. Only to find that they weren't rebelling at all.
Now that's not to say that the altar building was God-inspired even though they use some talk about how it is an altar to commemorate Him. They do indicate that it was fear-inspired. Fear of the other tribes leading them astray.

Don't build altars based on fear of what might happen in the future.
Don't make judgments about other people's actions.
Don't get angry. Hear the full story.