So a US court should make decisions not in the US interest because people in other countries use some software?

No. The U.S. court should make decisions in the U.S. interest. But this HN thread represents people from around the world who may not share the U.S. interest at a personal level. Leading to remarks which are trying to sway US opinion.

In a way, this thread could very well be monitored and commented on by a non US nation state