Beowulf offered to help that tribe for a number of reasons. First of all, he was known as a great hero who defeated many monsters, so there was probably no one else in the world who could defeat Grendel other than him. Additionally, his father was Hrothgar's friend, so obviously his son had to help Hrothgar in trouble.
because the officials are unable to catch the criminals of their country outside the country and they also escape easily from strict airport check-ups.