Payment for goods and services through cash can transmit Corona virus, doing transactions through bank, especially cash deposits can also transmit the virus. The safest way that we can create values and pay for goods and services during this time still remain blockchain and those selling off at this moment are doing so because they did not spend time to study the Blockchain technology and how it works.
What happened three days ago is very surprising but it's a big shake up to think, until now people think that Bitcoin is a bubble and no investment is really safe, so people are always in a hurry to dump when they see the market is crashing it's a domino effect and something that can happen in any market that is highly volatile.