There are probably lots of people. Those who bought the bottom at $16K not too long ago and want to bank profits on the runup to the halving. Those who bought the ETF launches and now see a correction so they're booking profits. Those who paid for their tax debts with their credit card and now need to raise money. Then of course the always popular lettuce handed individuals who bought at $72K after they saw the all time high articles and then quickly discovered they aren't built for this type of investment. Pretty sure all of these people still believe Bitcoin will be higher at the end of the year though.
The Iran/Israel panic really pushed them over the edge as well, I would assume. But I still consider the current dip a bear trap. Not selling. Definitely not before the halving.