The logic is really, really simple.
I'm all for "Free markets" as long as the economic behavior benefits society as a whole. A good way to measure this is whether it's in the interests of the two parties to participate in the transaction.
With addictive drugs, it's definitely not in the interest of the drug users to buy drugs. Do I have to explain this?
Therefore, people selling drugs, trafficking drugs, making drugs that are harmful and not beneficial to its users are doing so knowing that they are hurting their customers.
This is the same as if I harmed someone intentionally. Whether they agree to me harming them or not, I'm still harming them. It's not a net benefit for anyone, let alone society as a whole, to harm them.
Now, in the case of drugs, it's not some simple "oops I lost a few dollars." Drugs ruin lives. It makes it all but impossible for the drug user to ever be a successful parent. The long and the short of it is, whether the drug user ends up dead due to an OD or survives and somehow gains some semblance of life back, the drug user is likely ruined for the rest of his life, incapable of ever really being a very productive member of society.
In short, drugs kill people and maim them and turn them into invalids.
It's as if they were doing this directly to people. Whether the people choose to self-harm or not is irrelevant. Someone is giving them the tools and the materials to do so, and encouraging them to do it.
This is not the behavior of someone who cares about them or society as a whole.
In short, they actually hate us and our society and are actively trying to hurt it. They are killing people with their actions, ruining lives, etc...
Therefore, they are an existential threat that must be dealt with. Violence is justified when protecting life.
In conclusion, it is clear that drug dealers and traffickers can be killed. Whether they get a trial or not depends on the sort of crime they are committing. If they are a US citizen and we have suspicion they might be a drug dealer then maybe we put them on trial and present evidence.
If they are not a US citizen, then they get no trial regardless. If they wage war against us, we wage war against them. If they kill our women and children, we are justified in doing the same. If they wipe communities off the map, then we can do the same. Whether we use drugs to do it or bombs or nuclear weapons or missiles or bullets is irrelevant. We are justified to deal with existential, mortal threats with unlimited violence.
I literally hope and pray that we bomb the shit out of countries that are actively trying to hurt us. I don't care who they are. I don't care if they are white or black. If you wake up in the morning and think of how you can hurt my people and my country, I am justified in killing you.
That's the law of the Jungle. You want to hunt my family, I will eat you.
Libertarians -- go kill yourself and save me the trouble. It is not liberty to choose death.
Now you have a military police force and an endless number of police, surveillance, and unlimited pursuit. And they always escalate. Even for the most mild, silly, bogus infractions of law.