This is not unusual or a big thing. Saying it was on "two chains" is invalid as there is only one real chain.
It was technically a "block reorganization". Happens all the time. This one was just more significant than all the others, and people ran with the FUD over a trivial number of satoshi.
Everything is retarded.
Everything is frightened.
People are just too frightened all the time. You don't need much to make a significant amount of them panic.
Consider, this is happening in times of unprecedented security. Life was never as safe as today (confirmed by science and math).
I guess the media and politics with their ongoing FUD are teaching people to be scared, and that makes them so easy to be manipulated. Kids are growing up overprotected, and so on.
If you want the crowd to choose A, just make them fear B (and C...).
If you want to escape this, you need to focus on calming down, for quite a while.
bitcoin is the first global 24/7 market that everyone and their grandma can participate in without permission. almost all bitcoiners are able to sell all or at least some of their stack
with a stroke of a key. in contrast to almost all other financial products, where brokers, opening hours and other reasons create a friction that does not allow anyone to play nervously around with live changing amounts of money.
this makes bitcoin, this unique global 24/7 market,
structurally susceptible to media campaigns, FUD campaigns, online marketing spin doctors.
as long as the mindset of "buy&sell" smart, of "it can go to zero, so always be aware and have your sell trigger ready and alert" persists, FUD induced selling will be a thing.
there are CEO's of IT related companies who panic sell their btc stash at the local bottom because they hear "double spend OMG!!1!!!"
try inserting FUD about van Goghs paintings and see how many art collectors will panic sell their van Goghs. not a single one. tell weak hand bitcoiners that china will use the bitcoin kill switch tomorrow and you will have some that are happy to panic sell their entire stash within a few minutes. because it is possible. because bitcoin works so frictionless.
this is also one of the reasons for the high volatility.