Yes we should pray to those who heart us as Jesus said: you have heard that it was said love your neighbour and hate your enemy, but I tell you love your enemies and pray for those who persecute you (Matthew :5:39 and 5:43).
Jesus want us to live in peace and love to follow his steps. Once we pray for people who persecute us we will feel more comfortable and we will have inner peace this means that we have the ability to forgive them and not return the hurt for them.
And if Jesus forgive us and love us and even though he prayed for those who crucified him and when he was on the cross he said : father forgive them for they do not know what they are doing (Luke :23:24).
so how we the normal people can't pray for each other and love each other, isn't it great to pray for those who hurt us and ask god to enlighten their way and mind, why we don't pray for them to become better and nothing impossible with god.