The End of Effective Altruism?

Rationality and effective altruism brought us to this:

How could this happen? This is exactly what philosophy is supposed to fix. Ethics is the search for a system of rules that can’t be used by stupid people to do terrible things. lf you are looking for candidate ethical systems that seem least likely to be co-opted to do bad things, it’s reasonable to pick something like effective altruism and rationality. 

The ideas behind them are:

• You can use reason and quantitative evidence to figure out what it means to do good.
• You should put that knowledge into practice by doing as much good as you can.

Except, in this case, those principles seem to have failed spectacularly.