Why does this still happen

So I go down and get camped I don't kill myself on hook since it's waste the killer's time and let's my team repair gens the problem I have is when people try rescuing while the killer is camping. The killer won't just put whatever their doing down and go after the person rescuing they will tunnel the person on hook. So why do people still rescue while the killer is camping they can get on a gen repair it and with enough speed get an exit open and leave the killer only gets on kill.

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