Yes, there is a log and my report and debriefing will agree with it. I have no reason to lie about where I am and why I’m here.
There are no crimes against time. However, if I were to go on some sort of a murder spree and I admitted it when I returned, then I would be held responsible for the crime of murder.
I am no more able to affect your worldline than you are. Yes, I could make the changes you suggested but you must remember that there are an infinite number of worldlines out there where I didn’t and I don’t. In fact, there’s even a worldline out there where you’re the time traveler and I’m the one writing the question.
I think the war would be good for you and your society. I don’t want to stop it.
Nothing I do here will affect any other worldline. “My” original worldline will always be the same and yes I can make changes here that would make this worldline different from mine but so can you.