Why? The author of Metasploit was widely seen as a "bad guy" by nearly everyone until security researchers realized it was a net-positive to the security community.
If my system gets hit with a ransomware that's open source (and thereby likely very easy to create antivirus signatures for), I'd blame my system and the attacker, not the author.
Just to add some context to this guy's "opinions" -- for those who didn't know.
I wouldn't take my advice from someone who open-sourced a fully functional ransomware project for some klout.