This is pretty much what I was getting at. I suspect, though I lack hard evidence to support this, that the appearances of the prisoners that Hamas releases don't reflect the way that prisoners of Hamas are generally treated. Either way, I absolutely do not think that we can infer anything about the treatment of these prisoners from Hamas's own propaganda videos.Presumably that the reason the hostages being shown are in decent condition is because they're the ones that survived.
While that is certainly a factor, there's also just blatant propaganda at play here too. HAMAS knows they benefit from being perceived as freedom fighters or underdogs and not as radical murderous terrorists. Are they showing us only certain hostages they've treated well while others away from the camera are being mistreated? Would they treat any of their hostages with such mercy if a thousand cameras weren't pointed at them?
None of this is to say that Israel is better, nor is it even to suggest that the two sides are equally terrible. It seems apparent to me that Israel is using the worst abuses of Hamas to justify a campaign of violence and abuse against the Palestinian people. Even if Israel really is just trying to chase down Hamas, I find the way that they are carving through civilian populations to be absolutely unconscionable. If a permanent two-state solution is impossible, then I would rather see Palestine emerge as the area's one state. However, I'm wary of those sentiments being twisted into apologetics for an organization that, by most accounts not commissioned by them, isn't that great either.