By saying "blessed are those who mourn", Jesus does not intend to declare an unfortunate and burdensome condition in life to be happy. Suffering is not a value in itself, but a reality that Jesus teaches us to live with the correct attitude.
Pope FrancisAn evangelizing community gets involved in word and deed in peopleโs daily lives; it bridges distances, it is willing to abase itself if necessary, and it embraces human life, touching the suffering flesh of Christ in others
Pope Francis