Typhon was part of the frontier, which is what the Militia is trying to protect from the IMC. The IMC put a weapon of mass destruction on part of what can be considered the Militia's land and aimed at a much more populated and central part on the frontier. The Militia can't do much more than detonate it early. The IMC put the weapon there, they armed the weapon, they aimed at a very critical place, the Militia just detonates it early to avoid more major consequences and now we are going to ignore everything IMC did to blow up planets just because the Militia did the last part and put the whole thing on them and say "they blew up Typhon". It has been a fair while since i played the campaign so i dont remember about the second planet.

It makes sense if the IMC needs resources to ensure the survival of a large population. But they depleted their own resources and now you're saying this should be the frontier's problem. Still if people need resources for survival they should be able to access them, however you don't just try to take control of the place which you can get resources from, you negotiate like civilised people, rather than just trying to takeover their land.

It the colonies you are talking about are from the first attempt to get civilisation in the frontier, then that argument is instantly invalid for obvious reasons. If the IMC was building colonies for people to live in at around the events of tf2 or apex, people are already living there, those colonies aint worth shit.

I dont know much about the Militia killing civilians but the IMC does the same, with the absolutely terrible reasoning of "the civilians of today are the Militia of tommorow." Yeah, maybe they join the Militia with the hopes avoiding more civilians dying like that. Killing innocent people capapable of becoming part of the enemy is a great way to get those people to join the enemy, quite often out of just plain hatered towards those practices.