In fact I justified my assertion that no one individual would have access to excessive amounts of energy
Not really. Like I pointed out earlier too, your "justification" started with assuming the same fact that it tried to "justify".
You can of course simply make your own assumptions, which is exactly what your points A and B ARE
Absolutely false. Logic 101 disaster. In the form of argument you are making ("no small group of individuals of an unknown civilization can possibly have energy enough to space travel"), burden of proof is squarely on your shoulders. My points A and B are just 2 possibilities, for a rigorous argument I do not even need to specify them. They are just for your benefit.
The form of argument I am making (simply "not necessarily"), burden of proof is absolutely not anywhere around me.
IMHO B can be dismissed. While it is likely that we will find methods of travel that are MOST energy efficient we already know the uttermost theoretical limits on minimum energy, which are actually the ones I quoted, 450 pWh/metric ton at 0.1C (and in fact this number has been demonstrated to be low by an order of magnitude
If the distances are reduced by multiple orders of magnitude using other dimensions and wormholes, what good is a calculation using "C"[sic] ?
Would human civilization last very long if every individual had the equivalent of an arsenal capable of sterilizing the surface of the Earth?
It not only would, but it has. It all depends on the form of energy. To humans, an immense amount of energy is available in the form of free mass, using which most humans can just hurl rocks at each other. To someone in a "free mass" scarce society proficient in unlocking the energy potential of free mass, it might sound like a liberal overabundance of "energy", but we are utter fools sitting on an astronomical amount of energy , where single individuals are completely unable to destroy the civilization using this energy.
The alternative is what? Societies that stagger forward to advanced technology for a decade or a century and fling a few random objects out into the void before they go kaboom
In exactly the same manner as earth humans have an overabundance of energy in the form of mass, which is suited well for throwing rocks at each other but not for much else; the "alien" civilization might have trillions of exawatts of energy available to many single persons in a form which is not suited to going kaboom, but is suited excellently to space travelling through wormholes.
You're free to object, but I think the discussion won't move forward until you're willing to really examine your own assertions and weigh them against other possibilities.
All the points you have made so far show that it is YOU that are unwilling to consider "other possibilities". I am the one who is pointing these other possibilities to you, if you haven't noticed. That is what my points A and B are all about.