You're wrong, that's not heartless gamblers, that's concerned gamblers IMO who are trying to do their best to predict the evolution of the disease with the informations they aggregate.
I agree. Just placing a bet won't make anyone heartless. Gambling sites allow users to make bets on most of the topics that affect them, and not just sporting events. And making a bet is not going to make the pandemic any worse or better. It is the duty of the WHO and the national agencies to make sure that the pandemic remains contained. No need to blame the gamblers for this, when they are unable to do their job.