Father of Navy SEAL Michael Murphy has spent the last 20 years keeping hero son’s legacy alive: ‘A higher sense of purpose’

“If Michael’s story brings the attention of the public to our fallen heroes, then he has accomplished something — even in death,” Murphy’s grieving dad, who drives 45 minutes every day to visit the museum dedicated to his son, told The Post. “It was our goal to tell people and show people what these incredible…