Have you beaten the game? Or at the end? Because your question should be explained in-game. To answer your question however, it's because the government funded Bertrand and his Militia and that's how he was able to give his men military weaponry.
http://infamous.wikia.com/wiki/Joseph_Bertrand_III explains Bertrands story, and your right about the First Sons, i have plat'd the game as well, and could have sworei heardthrough the dead drops that Bertrand was government funded as well.. as to produce conduits himself... may have been mistaken though. But as my link says the First Sons had access to technologies and resources. This makes the most sense, since my latter answer was very subjective.. lol.
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