First, I'm curious as to what brought about this discussion; it's interesting I guess, but a tad odd.
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As far as traders: I like them, if it weren't for people selling their goods then there would be less variety of things period. Trading has led to people traveling to other countries in order to trade all throughout history pretty much. one of the oldest professions.
As far as traitors: it depends, who or what did they betray? If they betrayed my country, then I think the full force of the law should be brought down. If they betray another country for my country or an ally, then they're a hero (but maybe not to their country, and I might have a slight mistrust of them simply because they've already done it once). If this is between two countries that I don't care about, then, well, I don't care; though I might not trust such a person for the same reason.
Betraying me personally, then I would feel betrayed. I'd move on, but that would be the last time I trusted them. If it was someone that I loved or put a lot of trust in to begin with, I would be rather upset; there could be fistacuffs if it was another man, and maybe a little yelling if it was a woman. Again, I'd move on, but the time it takes for me to get over it depends on what it was and how much I was hurt by it. I try not to remain angry, bitterness is not a fun thing to live with, so keeping a chip on my shoulder wouldn't be my thing.
I would still trust people, but that's just how I am, I just wouldn't be fooled a second time by the same person is all.
