Some of those things are easier than others--it's easy to become a martial artist and not all that much more difficult to engage in human-population-reduction programs (witness how common eugenics beliefs were in the West pre-Hitler and how there are programs to encourage lower birthrates in poor countries via education).
Successfully building cross-temporal technology is a different matter.
Hmmm....kung fu fighting white supremacist environmentalists? That'd be an interesting terrorist group.
Depends a lot on your starting group. Becoming a Draka (non drakensis) level martial artist is probably more difficult than developing a biowar capability if your group are mostly geeky environmental types. The average Draka citizen had probably at least 2-3 sigmas of martial/athletic ability over the average American of our time line. Unless this group got its start among, say, a disgruntled band of Olympic athletes and special forces, they're exceedingly unlikely to develop beyond a level that just barely avoids disgust in an average Draka observer (this was a serious challenge for the Alliance spies in Under the Yoke).
The molehole technology requires of course, two things...nature to cooperate to make it even possible, and the skills and resources to make it happen. Exceedingly unlikely to see any sort of success here, although you could write an amusing timeline with them attempting to subvert the Large Hadron collider, perhaps adding yet more improbable accidents to its track record.
The Draka aren't really white supremacists, they're really more of an 'our ingroup' supremacist group. They had no qualms about making Nordic serfs. Their arguments, made implicitly and sometimes explicitly in 'Drakon' about the relative 'well-offness' of people in the more failed states in our world versus theirs are very uncomfortable. Would you rather be a median person in present day Zimbabwe or a serf, possibly a homo servus in the Draka analog of same? It's a hard question involving values. What infuriates many of us about the Draka is that they do not make a pretense to any of the universalist values that most of us pay lip service to (although if one examines our actions closely, it is clear we do not truly believe them). In actual practice, my estimation is that living under a Draka yoke is about as bad as living under Roman domination, or Nazi domination when you're not a Jew, or non-Stalinist Russia. Considerably better than Stalinist Russia, Nazi Germany as a Jew or the world of 1984. In short, it's pretty similar to what most people have had to live under for most of post-agriculture human history.