I didn’t say they cared for their comrades but I am surprised that they weren’t smarter about your snare. They are usually pretty smart about dangers. Maybe the difference is that hanging a coyote on a fence is intended to warn them off and be seen from a distance whereas you were setting snares with the intention of luring them in. Did you bait the snares?
The crawl was the only good way into the sheep pastures on that section of fence. They have no fear of their dead relatives no matter how they are displayed.