The thing is, for tactics to work, the other side has to not counter it. It's not like you can kill someone using those tactics in one day. If you're smart enough to figure it out, then so are they. If the other side is smart enough to counter you, then it won't work.
But, as I said, everyone in this story is crazy. MC wanted to stop being taken advantage of, so he goes to take control. His entire team goes out to raid other people just like themselves and then turn them into slaves. These are not noble guys, and MC thinks with his dick anyway. Taina wants to make the place better for her people, but really she just wanted to be the leader, and ended up in conflict with herself for wanting MC instead. None of these people are right in the head, and they didn't get to where they are by being smart, and I don't mean just the examples above, I meant everyone. I don't worry about it, I just play the game. ^_^