Besides, I can imagine a horrible fate would await the two youngest children had they been evacuated. I don't think they would have lasted as long as Sam http://walkingdead.wikia.com/wiki/Sam_Anderson_(TV_Series)
My point was that the group should have remained on the island, where they have control of the entire land, and not have to deal with other, endlessly connected areas of towns, cities and states like Rick's group, who eventually ran into numerous living and reanimated threats thanks to all having access to each other. An island removes that kind of constant danger.
Regarding Sam lasting longer--I disagree. The youngest children understood what walkers were, and how they had to be killed (recall the action figure with the red forehead dot simulating a gunshot). Sam was completely sheltered from the reality of the ZA, then rendered shell shocked / looney by the Wolves' attack and walkers. Being raised in that way would have made him least able to survive than any other child ever seen in TWD / FTWD.
I think a "power pill" is preferable to being eaten alive, don't you?
Suicide is not preferable, and its not island father's position to play judge over the lives of his family. If island father was so convinced suicide was the way out, then should have exercised that option for himself, and not forced his paranoia on anyone else.