the news of Coinbase,ETF or Goldman Sachs , latter said to reconsider launching a cryptocurrencies division, should not have such an impact
seeing bitcoin go down from 7400$ to 6400$ in a matter of a day I read the news and only those three seem to be relevant enough to cause such a drop
If it looks like the events you've mentioned should not have such an impact on the price, maybe it's because they actually didn't cause the drop. I tend to believe that it was again a big sell by a whale or two which caused the drop. That's how they regularly make money, sell big amounts to drop the price, then buy back at lower price, then sell again if price has risen 20%, and so on. They have put it on the loop ad infinitum (as they wish, but in reality it won't work at some point, when the demand will be so high that dumping of 100,000 BTC will have almost zero effect on the market).
in fact we do not know about the cause-effect and can only speculate
but to drive the price down that much required around 17.000 bitcoins to be sold (according to Bitfinex charts calculations yesterday)
it is almost half of the total trading volume, so news or not news, someone sold that much and we do not know why or who
could be a random whale who decided to clear some profit and cash in or a group of traders reacting to the news or ....something else like this:
https://bitcointalksearch.org/topic/2018-09-04-111000-bitcoin-wallet-becomes-active-after-4-years-of-dormancy-5007367