As another potential candidate, I must apologize for not having had the time to respond before now; I've been unable to get home before 7pm most nights, and the last two I leapt straight into recording via Sausage-cam the speeches then being given... the last 4 are now up in the thread elsewhere!
But to answer the question of Justice, if I may bring in a little of the philosophy from the world Lord British and the Avatar came to us from, and which I too once inhabited... Immanuel Kant spoke of the "Categorical Imperative", which put simply stated that a Moral Maxim must be able to be acceptably universal in order to be declared necessary.
Thus with murder, the positive principle can be described as "I can commit murder"; but it can never be a universal because, whilst you might think of all kinds of reasons you should get away with, or someone else deserves to be murdered, if you universalise it to say "anyone can commit murder", this would imply people could murder you in turn; which no sane person would want anyone to have the right to actually do.
However the negative proscription "You should never commit murder" can be safely universalised, as every sane person would, at least in theory, argue that all should be safe in their bodily person from unreasonable violence. Whether in practice this holds true is a different question, but as a moral principle it holds.
Now, in the example we have been given, the moral choice we are asked to consider is a little more subtle; let me try paraphrase the question.
"Someone is alleged to have committed murder"
But this is just a statement of fact, someone has said that someone else is a murderer. The issue we actually have, and as Lord Protector should try and address is this;
"Can someone be accused of murder without judgement on that claim?"
If we try and universalise this, to being "everybody can be accused of murder without being judged for it", it would clearly become a recipe for mass murder, as there would be no way to prove anyone was ever guilty of it as there could be no trial of the claim. Obviously we cannot take "Can somebody" as a moral maxim either then. It opens the doors to abuse. Therefore nobody should be allowed to be accused of murder without the powers that be investigating.
As Lord Protector, you must stand firm on the principle of answering the charge, no matter where the rumoured murder is living.
However, the term "accused of murder" itself needs to be teased apart; in the real world, we cannot allow "anybody can accuse anybody else of murder" either. Some people are just liars, or mad, or vindictive or jealous; thus we cannot take any one accusation at face value either. It must be proven to be a reasonable claim, and be a solid case before we start acting on the word of anybody at all.
As Lord Protector then, you must insist that all evidence be presented to you in your official capacity before acting to arrest anybody. But if evidence there is, arrest there must be.
Why? Because it could never be a universal that "Someone about whom there is justified suspicion they are a murderer should be allowed to remain free." If we were talking about something which was down to personal choice, such as the endless debate about differing models of living, the question is more complex still; but murder, as we have seen above, is not going to be legal in any of our city states. It's a universally proscribed action. On this basis alone, the Lord Protector must act.
But where, once the arrest has been made, should the trial be held?
I will spare you even longer philosophizing, but let me outline the basic issues which I believe decide in favour of a trial within the jurisdiction the crime was committed;
* It will allow easy access for the relatives of the deceased to the trial proceedings
* It will help limit the ability of people to just "move away" from being brought to Justice, because they must return to the scene of their crime and answer for it.
* It will enshrine the basic respect for evidence based trials, because in order to receive the prisoner in the first place, you will have had to present convincing evidence to another's standards, not just your own
* More abstractly, it will start the process of integration of disparate political entities at at least the Justice levels.
* Whilst in the other direction, it also shows a tolerance though for regional authorities, by respecting their authority.
Now... a more difficult question would have been "Would this hold true in the case of crimes of conscience, or thought crimes?"
To that my answer would be; No. No arrest would be made for breaking crimes against state enforced morality. And to those who say "But it would be an insult to our independence", let me remind you I have no plan to arrest any Vesperian or Trinsish traveller the moment they set foot in their opposite city, and you cannot possibly require that this be universally the case...