In the Greek the mood of the term Peter uses (the optative) indicates that suffering is a possibility, not necessarily a reality for all his readers at the present moment. Jesus had made clear that those who are faithful to him will undoubtedly suffer in this life (see below) but had not said that all his people will suffer the worst of persecution all the time.
14 But even if you should suffer for righteousness’ sake, you will be blessed. Have no fear of them, nor be troubled,