Even the religious books admonish us to mourn with our enemies when they are mourning and rejoice with them when they are rejoicing but some people, for obvious reasons think it is a good thing to rejoice when their perceived enemies are mourning.Even the religious books admonish us to mourn with our enemies when they are mourning and rejoice with them when they are rejoicing but some people, for obvious reasons think it is a good thing to rejoice when their perceived enemies are mourning.