Hunter's Curse

In vampire diares we saw about hunter's curse in season 4 and season 5.

When a vampire kills a hunter from a brother hood of the five (even the said vampire is a original or a hybrid ) causes the vampires to be psychologically

tortured by the specific hunter after death by creating powerful hallucinations, slowly bringing them to a madness that coaxes them into taking their own life.

When Alaric saltzman killed a hunter who is torturing damon salvatore, why

Did'nt alaric was psychologically tortured because of the hunter's curse?.

So we know that Katherine killed Jeremy. but Jeremy was a vampire hunter. so did Katherine ever have the vampire hunter curse or did we just not see it?

This is a late question and I feel stupid for forgetting but can someone remind me if klaus killed the original 5 and never truly died then how did the next 5 hunters get passed onto the next generation?

I couldn’t remember if it was concluded in the show if the hunter’s curse could do any damage to anyone that was not a vampire. I thought this was mainly because vampires were cursed for killing the hunters which are meant to wipe them out... In which case it doesn’t bother witches and other supernaturals meaning they could kill the hunters in the vampires’ stead? I don’t know. What do you guys think?