Read the excerpt: "The school was a second home for many of those children — not...

Questão de Inglês da banca AMEOSC aplicada no concurso Prefeitura de Barra Bonita SC (2025). Confira a resolução completa abaixo:

Read the excerpt:

"The school was a second home for many of those children — not because it resembled one, but because they had no other safe place to be."

What is the author's main purpose in this sentence?