Look, it makes sense at any time, but right now with companies varying sets of rules around a pandemic, forcing employees back to an office, mandating a vaccine if they do, closing offices, etc. there is bound to be at least one person who just isn’t very happy with whatever stance the company has taken.
Would the vast majority of them stoop to purposefully installing ransomware on the corporate network? Probably not, but the hacker doesn’t need the majority, they need 1. Just one person to be so angry, and also unethical, and they are in.