Also a criminal who will likely end up in jail at some point. His companies aren't exactly uncontroversial.

There's a reason people call this guy (Ken Griffin) Madoff 2.0

Why on earth would he end up in jail? No don't just tell us to Google it, obviously it won't turn up anything. What allegations are you referring to?

The person you're responding to is likely a member of the meme stock doomsday cult that keeps blaming Ken Griffin for their AMC/GameStop losses.

Opportunity costs are real. Opportunity costs are real. Opportunity costs ARE REAL. OPPORTUNITY COSTS ARE REAL. ¡¡¡ OPPORTUNITY COSTS ARE REAL !!!

Ok, but the opportunity costs pertain solely to the spender, and even if not they are priced into the market. why do you feel entitled to the fortune that someone else decides to use for a vanity project.

How do the costs not apply to the tens of thousands of lives that could have been saved?

Because the thousands of lives were never entitled to how someone decides to spend their money in the first place, and if you believe otherwise then this literally applies to everyone and their income. Example: How can we justify going out for an ice cream, when that same money could be spent to vaccinate several people from malaria and save their lives? Why is it ok for middle class earners to spend money on frivolous things, but not for the wealthy? All that surplus money can save tens of thousands of lives!