Ralph is initially voted as the leader of the boys but overtime he loses this power as the boys begin to follow Jack, why?

The longer the boys are on the island, separated from the
rules of society, the more savage they become. Ralph represents order, the adult world,
rules, which at first, when the boys have not been separated from society for so long,
appeal to them. They take comfort in setting up a mini-democracy on the island, with the
calm, intelligent Ralph as leader.

However, the longer they
are left to the evil within them, the less and less Ralph is able to control them, and
the more and more they become attracted to the violent Jack and his hunter mentality.
The more they are attracted to Jack, the crueler they become as well, until finally,
they turn into savages and turn on each other, killing Simon and then
Piggy.