No, it doesn't.
SPAWNERS DO NOT OWN WHAT THEY SPAWN.
Repeat that over and over until it sticks in your head.
Then repeat THERE IS NO SUCH THING AS AN EARLY PULL IN KILL-ON-SIGHT CONTENT until that sticks in your head as well.
I spawn and conduct to help the greater community. I encourage reasonable patience and cooperation to give other players a reasonable chance to participate. If someone wants to pull a S rank while everyone else is still waiting to give others time to arrive, I don't yell at the person who pulled. Instead I encourage everyone else to be patient and watch the puller solo the S rank for a bit.
"Early pulls" wouldn't be a problem in most cases if most of the hunt community wasn't a slave to FOMO and copied the "early puller". As long as you get a hit in before it dies, you get credit for the kill.
I also respect that SE designed the Hunt to be a free for all, first come first served. If others prefer to hunt differently, I respect that. If I'm out scouting for a train and run into players already killing one of the hunt marks, I'll let them know I'm scouting the train, about when I expect it to start, invite them to join the train and wish them luck with their kill. Once I get the rest scouted, I circle back to where the mark was to see if they killed it or not.
You know what? Most of the time it's still there when I go back and those players join the train instead. It's there because I had respect for their right to engage in the content as they wish instead of giving them grief and yelling "YOU CAN'T KILL THAT YOU HAVE TO SAVE IT FOR THE TRAIN". It was still there because despite what some treat as a terrible crime, I invited them to join the greater community and still wished them luck in killing it. I made them feel welcome instead of making them feel like pariahs.
Get it through your head that your rage and hate for others that hunt within the rules of the game even though they aren't hunting the way you want them to is the worst possible thing for the greater community. That is what creates most of those "early pullers" you rage about - players who had simply been playing the game and other players started harassing them for it. Why would anyone in their right mind want to join a player community that treats other players that way?