Case 1: Disagreement in-game that could be resolved with a simple argument, agreement to disagree, or discussion.
Result: "I'm gonna drama you!"
Case 2: A previously banned user gets harassed upon making an alt, despite mentality supporting improvement.
Result: Drama topics nitpicking at every mistake.
Case 3: User loses patience and gets banned again. Returns with alt but doesn't let anyone know. Shows improvement.
Result: Someone finds out and makes a drama topic, people rip on past mistakes again.
Case 4: Typically respected user gets into a personal dispute with another user, which should be resolved in private.
Result: Other user makes drama topic, respected user suddenly gets backlash outside of drama. Harassed over steam, etc.
Case 1 is how drama typically works. Interpersonal drama gets directed here where the community can discuss it. Resolutions do happen here, and it is more likely to happen here than in another topic where uninvolved members try to push yhe argument out of the topic.
Case 2 and 3 are again cases of Drama starting elsewhere and getting redirected to Drama. Not an example of Drama affecting other places.
Case 4, drama is directed to the Drama section again, job done there. Other users follow the case through other means of communication, outside of the community. This is the fault of the user causing drama, as well as choosing to open outside communication with members of the community (you're not forced to do this and this is a bigger cause of drama than the existence of the Drama section), and their failure to quite easily end contact with a person bothering them. Steam and Skype have block facilities, Facebook has reporting abilities, and if there are direct contacts or harassment the police exist.
Your cases aren't examples of the Drama topic causing drama to spread elsewhere. Your only possible example is that people follow others through different means.
If the Drama section was gone and posting drama was bannable it wouldn't prevent the drama happening in the first place. And it wouldn't at all stop people being bothered from outside yhe game/forums. That is entirely an individuals fault for choosing to open contact with strangers on the internet.
You mention that issues should be worked out personally. How does this happen with no Drama topic or no drama allowed? Or do they open up contact through Steam or Skype, which is just asking to get bothered through such means as you're opposed to. It's not like when you get an issue involved with banning ingame, which is common, that you can go back to the server.
I can't agree more with Jaxx, who brings up a good and ignored point.