A sotapanna has unshakeable faith in the Buddha, Dhamma, and Sangha. If a person would come along and say there is no Buddha, Dhamma or Sangha, and threatened to kill him if he did not agree, the stream enterer will not budge...he rather die. Stream enterers are not like worldlings who are dirt cheap abundant in the triple world. Besides they are unlikely to advertise "I am a stream enterer, know this" First we must get our facts right about Sotapannas, true ariyas.....so how common are stream enterers?
To one who has grasped and realized Anatta, he will not react "He rather die". Even if the Citta were to arise with the thought, he will just observe and watch it dissolved and without reacting to it.
Just like a Bodhisattva will seek to become a Buddha if there's no more beings to be saved. But to a ripen conditions of Bodhisattva, whereby Anatta/Sunyata is well grasped, there's indifference as to being still suffer or not.
Achieving to this status is rare and need stringent cultivation of the 8 fold Noble path along with Vipaasana, where Wisdom and Compassion comes hand in hand.