I think its awesome that HN somethims gets into other subjects, the community holds a nice balance without to much regulation.
However, there's something about that in the guidelines:
"Off-Topic: Most stories about politics, or crime".
Also, "anything that interests the group" is a terrible way to run a site like this, because eventually the group grows, and if you don't place limits, you'll start getting Ron Paul stories, taser stories, etc... etc...
However, I think it's pretty apparent that ending the drug war would benefit more people in much more profound ways than all of the software everyone on HN has ever written. In fact, I'd say only the computer revolution as a whole has benefited humanity more than ending the drug war would.
But that doesn't mean HN should be dedicated to those things.