Again, the time thing doesn't matter to me. This show plays fast and loose with numerous situations where if we looked at things more realistically, 99% of times, the main characters would be dead. Ollie was stabbed in the freaking chest (which was strangely altered when we saw the wound again) and kicked off a frigid mountain in nothing but a pair of pants and survived. Sara being a bit mushy doesn't mean much.
Expecting realism to be the deciding factor on a superhero show doesn't really fly with me, so that's why I'm looking at this from an emotional and personal level, and taking that into account, what Laurel is doing makes sense, and Ollie would be a jerk to oppose it.
As for Nyssa, she's been drinking too much of the League Kool-Aid to be making a logical choice in this situation. Nyssa puts honor and tradition above life, and while that works for her character, I don't think that leads to the best decisions. In the short time she spent with Laurel outside the League, you could already see some of it starting to fade, and her humanity coming through.