Obviously this behavior doesn't apply to all of them, but it's a clear effort by some of them to immediately appear more palatable to random IT worker, the execs, and the lawyers who are watching the who process play out.
And it also lines up with the fact that ransomware groups have freaking HR departments to handle their employees.
regarding drug dealers, I wouldn't consider it a good comparison. the actions of one dealer typically doesn't affect others, they're just not that connected beyond professional recognition/courtesy. If dealer A is shorting their customers, dealer B absolutely wouldn't care as why would they? they have no relationship, and it'd probably mean the customers go to dealer B instead. business will continue as usual even if one bad actor is doing shitty stuff to their customers.
with ransomware that is not the case -- if public opinion overwhelmingly tells there's no sense in paying because the ransomware gangs never follow their word, that affects all the gangs, not just the bad actor. the gangs already have a hard enough argument to make as to why the targets should pay so anything that frustrates that further is frowned upon.