I suppose it would be if it were some kind of command to the masses from God himself, like in a biblical verse or official Church teaching, but would God AFTER giving us the Holy Spirit to lead the Church at pentecost, and giving said Church power to teach, and lead, then the Church says you are free to believe or not believe this prophesy. ( I am not sure even if the Church has said this.) so if the Church says I am free to believe or not believe and I choose to not believe then am I commiting a sin by choosing not to stick around to rebuild a broken planet when I could actually be in the kingdom of heaven. And another question, why are we rebuilding, and to what end. after this great chastisement how long must we endure until we are ALL granted the beatific vision.
From another perspective, wouldn’t it be the worsip of a false god to want to remain here over heaven?