the only worthwhile conducts of human life are technological and scientific research, and building infrastructure

Wow... the basis of my philosophy! IMHO: technological and scientific research - and art! - are basically the worthwhile "ends".

Building infrastructure (as well as mining, agriculture, most manufacturing, health care, SOME lawmaking, SOME politics, SOME entertainment, SOME advertising etc etc) ARE worthwhile, being the means to the abovementioned ends.

(and MOST politics, entertainment, lawmaking, advertising and so on are plain old not worthwhile, or even harmful).