what....the....fuck......does that have to do with the Sermon on the Mount.......have you gone daft?......
The burning issue of the first century was Roman occupation of Palestine.. The taxes, abuses and laws had caused the Jews to split into five factions.. and they quarreled amongst themselves. There were the Zealots. Herodians, Sicarri, Pharisees and Essenes.. The Essenes basically retreated and moved to the area of the Dead Sea.
Jesus was trying to teach them how to survive.. and how to shame their enemies with non-violent resistance because he knew they were on a collision course with the Romans and they would NOT win.
If you knew anything at all about the political situation in Palestine, you would know this to be true. Their discontent was further fueled by high unemployment because Herod's construction projects were finished.