Mondays are for Chaos

So I run two groups of D&D and my group that meets on Monday officially became bad people about two sessions ago. When they created their characters, the Lawful/Chaotic distinction kind of put them off. Not wanting to pigeonhole themselves, they all chose Neutral. This is understandable to me, but after a couple of months of murder and mayhem it's time to call it. They've gone to the dark side. Here, I'll give a brief run-down of the events that lead up to this decision:

• They met outside a burning inn and immediately decapitated and placed the heads on spikes of the kobolds who burned said inn.
• Robbed the wizard's house in the first town they visited, fled into forest.
• 3 die in forest, remaining two duel over belongings of everyone. Halfling leaves victorious and loot laden.
• Group meets back up in town after some hand waving resurrection that the Halfling is still pissed about, group murders more kobolds, revenge cited as reason.
• Halfling strangles street tough in broad daylight.
• Group flees murder charge across ocean, gets involved in Thieves Guild and starts race riots (against kobolds). 3 days of fire and carnage follow.
• After things die down they pull off massive heist of a bank and become rich as fuck.
• Group tries hand at dungeoneering, sacrifice all of their henchman, Halfling almost becomes wereboar.
• Group flees across ocean again.
• They meet tribal peoples, don't immediately kill them, but instead argue for 30 minutes over creating a slave trade.
• Raid on Imperial outpost 1 goes off way too easily, group super confident. Sends heads and testicles back to the mainland.
• Raid second outpost with help of druid/panthers. These troops have done nothing to them, just happen to be from same country where the Halfling is wanted for murder.
• Ambushed at third outpost, 45 minute argument about creating slave trade again.

Anyway I think this is enough. They now have at least 3 factions that could feasibly be hunting them. I'll give them one thing, they make my job easy.