Full Historical Chat -- Even after leaving server.

I'm having a serious issue with this idea that what we type, doesn't have an option of being logged. I was randomly booted from a server, and the argument was, what I had said was so outlandish, that it required a mod to intervene. 

I have no log, no screen capture, no nothing to look back on after getting the boot. Regardless of the outcome of this, I sure would like an option. I assumed like IRC, and other chat programs, we'd still have access to at least our own typed content log on a server, regardless of if we are joined or not. Even if it's in a file somewhere. But there's not even an option for it yet? 

So please, add an option for chat logs...