Usually if you see the unavailble message it means the account was banned, OR (most likely) they deleted their own tweet.. could be misinformation or just something spelled wrong and re-tweeted.. or could be nefarious too I suppose!
Twitter makes money off of controversy. If everyone is fat, happy, and contently working, they don't tweet much. Twitter blows up during civil unrest. They have a massive financial incentive to steer the narrative to "volatile", and they use SJW's as content arbiters to be the useful idiots to make that happen.