Fire! Brimstone! Hell raining from the skies! It is a more effective way of ensuring victory. We will redirect nearby meteors and split them into shards, that will then fall to your planet in controlled amounts and locations. They will be seeded with certain isotopes, making them spread fire to everything in their impact radius.
You will no longer be free if you're dead. We will take away your freedom by killing you. The world, however, will be doing perfectly fine without you and your kind. Better, even. We will bring the glory of the dragons to this planet.
You lack perspective, my friend. If I decide to to fight to death or end my life, my choice to do so gave me the freedom. Death are just freedom from the world' pain You are however a foolish sheep that follow the herd. That is nothing glorious over that. You can't be the master over the world if you can't master yourself or your perspective on it. That is nothing glory over doing a homnicide on a race, just meaningless violence. Besides I don't would have much to live for, because the Earth would be in atomic winter.
... The world lost 85% of its human population? (Not including you/family/friends)
Depends on the amount of destruction this comes with. If it only means less people, seems ok to me. If it means stone age for the remaining 15%, rather no.
... The cause of that was an overtake by draconians coming from another world?
Depends on the amount of freedom which they grant us and the general way they want to manage their colony. Could be alright, could be horrible. Could even be better than what we have now if they give us advanced technology. More details needed.
... You had to swear your allegiance to the draconic races?
Depends solely on their actions and how I value those actions. If they do and stand in for what I consider to be good things and the right way, why not?
There were great sages among your kind that you have taken as gods out of foolishness. There were also many gods that left your world ages ago. They knew of us and our plans. Or at least, they had a vague idea that they were given through visions and the like.