Surely, if there was a completely legal way to inflict great harm on humanity for only $1Million then there are a ton of people/groups with the desire and resources to do those things.

There are legal ways that you get by playing off laws of different legislations against each other that are not trivial to see. Take pre-2013 Wikileaks. Immune to being sued in the City of London for defamation because Wikileaks and Julian himself have no fixed residence towards which to deliver post. Being registered in Sweden to into account their Whistblower protection laws. Having server in yet another country to profit from additional set of laws.

Neither desire nor monetary resources alone are enough to come up with such a scheme. It need people with high intelligence.

LW is a forum with educated people with a very high base IQ.

Wikileaks was well intentioned but I think you could find a bunch of people that argue that it produced significant damage in the world for a cost of less than 1 million dollar.

Bitcoin with it's enabling of payment transfer for illegal services might also produce a lot of harm for far less of 1 million dollar in initial development costs.

Ideas like Bitcoin or Wikileaks aren't expensive but they require deep thought.