CYA for the airlines. Ridiculous.
I'm in Scotland right now, and the trouble I went through to get here was insane. Delta made us wait for our plane for nine hours, then told us all to leave and they promised they'd have our plane ready the next day.
Next day we show up and...the flight is delayed again. So everyone goes to the Service desk for an update, and one dude gets a little impatient - not out of line, just a little frustrated after being delayed for more than 24 hours, now - and they say he's inciting a riot and they throw him out.
I wanted to record what was happening, but I checked the rules first, and nope, not allowed to document their ineptitude or abuses. Outrageous.