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.
Theres still no mass adoption so we cant expect that bitcoin will be the best currency right now. Some users still dont know where to spend their bitcoin and the only option for them is to convert it into fiat money. If theres already the adoption then we can easily see bitcoin on the top of everything, but for now lets accept that bitcoin is also dumping.