1,The fall in US stocks caused Bitcoin to fall at the same time.
What dump?
Cant see anything.
2,Singapore regulation.
So what? Every day some country is saying something about bitcoin. No one really cares untill its US.
3, SEC wants to sue coinbase.
Fake news. SEC does not wants to sue coinbase. SEC just worned coinbase not to launch savings products.
4,It is related to El Salvador
Buy rumors sell facts. The only thing that may trigger this sell off, from the list you posted, but it was just a trigger event. Most of the dump was done by overleveraged positions and no big correction since 29k (no strong support to stop at).