Why would someone who believes that there is a deadly, airborne, highly contagious virus do this?

Why Trump Risks The Lives Of His Supporters At Rallies

NOTE: This explains what has not been explained so far. After all the excuses as to why he lied and played down COVID (stock market and panic concerns), one thing has not been explained:

Why Trump is still having rallies and not encouraging the use of masks at events even today?