Why does Wiglaf scold his fellow soldiers after Beowulf's death?

Wiglaf is disappointed in the troops for running in fear instead of standing in loyalty when they fought the dragon.

His friend who he has alawys been loyal to(Beowulf), died(in victory) fighting the dragon unfortunately..

Beowulf even went through the trouble of shrouding them with honorable armor for battle, and he quoted the armor was "useless.