Sorry but it’s just so obvious that relying on, “Just use mind reading magic to see if there’s more traitors” is such a copout because you need to do that to literally every Sunreaver in which case, the ones who are traitors will just up and leave in advance in which case you have to imprison them all anyway.
He’s a traitor, the degree to how much of a traitor he is, is moot.
The point isn’t they don’t have magic, the point is you don’t try and arrest someone trying to kill you by trying to subdue them because no competent police force trains people to fight at a disadvantage.
Shoddy evidence would be if bad things happened and Jaina had a hunch it was the Sunreavers, the fact the Sunreavers betrayed Dalaran twice was proven.
Also there seems to be some confusion about arresting someone and sentencing someone. The Sunreavers were all arrested because during times of War when the other side is trying to obliterate you, arresting them so they are momentarily subdued is fine.
What would have been wrong is if Jaina sentenced them all to death even if they surrendered without first proving they were traitors, but arresting is fine.
Jaina had to weigh her options, she knew the Sunreavers were a compromised group and knew that not taking immediate action, especially with her knowledge of the consequences of not taking action during the same expansion, was just not worth the risk.
That would be helping the entire world due to one side who clearly has no restraints wanting a WMD. Again, being neutral only means, “We won’t take action until one side becomes a threat to us even if they don’t intend it”.
Let’s say the Divine Bell wasn’t being held in Darnassus, but say in a titan facility and Jaina helped ward it to? Would that still be ‘aiding’ the Alliance?
Innocent until proven guilty is a thing when it comes to sentencing, not arresting lol, if it was it’d cause so many problems.
Imprisonment and seizure of assets in situations like in MOP yes. Torture has nothing to do with the Purge and mere suspicion no, but let’s face facts, in MOP Horde are basically a terrorist group with possible traitors working for it through a compromised group(Sunreavers).
If they are going to resist arrest then they have to suffer the consequences.
From Wowpedia:
Accusing him of treachery (an accusation Aethas claimed was false), Jaina ordered him to take his people and leave the city. Unwilling to accept her ultimatum, Aethas proclaimed that Dalaran was the home of his people, too; as Jaina herself had said, many of the Sunreavers had called Dalaran home for over two thousand years. Resolved, Jaina simply stated that she would have to remove them by force. She took Aethas captive and teleported out of the fray.
There isn’t really a RL situation comparable to what happened in MOP.
Placing the safety and future livelyhood of one’s own faction and people over the rights of potential traitors to those who wish to obliterate you, yes.
Well there’s no proof they did or didn’t get their property returned so it’s moot.