[parsimo2010]

First- the author of this blog post is the CEO of Anthropic, an American AI company. Of course they are going to argue for export controls if it can hurt their competition. They get to benefit from anticompetitive practices with none of the legal risk! So it's not even about keeping the "bad guys" from having things, it's really about making more profit. Also, you can typically assume that anything a CEO publishes is in a pursuit to raise stock prices, it has nothing to do with morality. If CEOs were moral people most of them wouldn't have become CEOs (there are probably a few CEOs that are truly good people, but I'll bet there are more "wolf in sheep's clothing" CEOs that use an image of morality to improve their company's reputation).

Second- aside from the specifics of this post, you don't have to believe that the US is good to see the logic of export controls. There are a number of countries that are openly hostile to the US (Iran and North Korea), and also some that are semi-privately working against the US (like China). These countries will take any advantage that they can- they will steal IP and use the US's development resources to catch up to the current state of the art at a reduced cost. So you don't have to put this in terms of good vs. bad, just think of it in terms of things that benefit the US and things that don't benefit the US. Whether you think people are evil is irrelevant, it is very logical for the US to put export controls on things that it doesn't want to give away for free. The US wants to preserve its advantage and make it as costly and difficult for these other countries to catch up.