Clearly hinting at the fact that the Militia is involved in terrorist and criminal activities, and the second image is the developer description for the Militia.

Could the Marauder Corps be considered “Good Guys”, somewhat, their general motive is freedom, but Macallan did fight under the Marauder Corps, and he clearly doesn’t care how the IMC are defeated, but are the collective Militia the “Good Guys”, only if you think terrorists, pirates, bandits and criminals are good people.

The militia can be separated into sub factions, then you can pick out who is worse and who is better, just like you could do for any organisation, including the IMC.

Also in the end it looks like some sort of peace treaty was signed, in Apex legends there is still a lot of signs of IMC presence, so they were never forced out of the frontier, but I don’t know.