The Peace by Force Conspiracy

The main character of the story is an industrialist  whose outlook had been affected by the death of his wife to an Islamic terrorist's bomb, and the assault and attempted rape of his housekeeper by a gang of thugs, in addition to other items always appearing in the media.

He befriends and  helps a group of aliens who have discovered by means of their powerful sensors, deposits of a mineral on his property which is essential for their existence.   In gratitude for this they leave him with some of their advanced technology,and one of their heavily armed spaceships when they learn that his attitude to evil is the same as theirs, with their blessing for him to use it in an attempt to eradicate all forms of evil from the world wherever he can find it and by whatever means necessary.

The story is about him and his dedicated team of like minded friends in his attempts to keep faith with the leader of the aliens, a little love interest on the way, and a twist in the story right at the end.