Semi auto in the conventional manner has enough ability to effectively kill as any other method short of a belt fed machine gun.
When the SLR was first issued to the British military it was semi automatic, automatic and single. That was soon modified to take away automatic, ammunition was being used far too fast ( made the accountants unhappy) as semi was more than adequate. My other half loved his though he also had a GPMG as well as using other weapons ( such as a Bofors anti aircraft guns and Rapier missiles. His trade was gunner. Bofors to Rapier shows the beginning to the end of his service.)
He said the Aussies he'd worked with also used the SLR.