"Why [name of a weapon] is in this place and not this one?" Well, let me explain why I picked those places [be warned though, I made this pixel art as a joke, and so are these descriptions]:

Lawful Good (Homewrecker): You're sacrificing the utility of the Powerjack, or the ability to combo with the Axtinguisher (to name a few) just to save your engi's buildings from those spies, you're doing some teamwork there without focusing on you, hence lawful good

Normal Good: (L'Entrager): Just like the Homewrecker, but for your own self, you're using a weapon that's helping you to say cloaked longer, which is good for you, but not for others, hence normal good

Chaotic Good:(ConstructionPDA): You can help your teammates with your dispenser and teleporters, but can also wreck havok over the enemy team with your sentry gun, hence chaotic good

Lawful Neutral (Shotgun): One of the stock weapons, but also one of the most reliable, which can help against most classes in most situations. When in doubt, just shot shot

True Neutral (Bottle): Like the name suggests, the true neutral of all TF2 Weapons, all the others weapons in this slot change how Demoman performs in one way or another, but the bottle is still reliable, even if it doesn't change anything, hence true neutral

Chaotic Neutral (Rocket Launcher): The crits with this weapon can cause some serious chaos, but it still isn't very overpowered or underpowered like other weapons, which makes it worth it of Chaotic Neutral

Lawful Evil (Short Circuit): Most of the time this weapon is used when close to the payload, and while it denies the purpose of some weapons of 2 classes, most of the time your team will be close to you, which you're helping to make them survive indirectly, hence lawful evil

Neutral Evil: (Scorch Shot): Scorch Shot

Chaotic Evil: (Wrangler): Your team doesn't matter anymore, you're just focusing on getting the most kills with an almost undestroyable machine, you just wanna watch the world burn. Truly makes this weapon receive the title of chaotic evil