Why does justice wargrave go to the Indian island in then there were none?

He wanted to create the most unsolvable, greatest, mystery death that nobody could solve. He had been a judge for so long and he wanted to do something bad. He had a craving to kill, so he decided to make this scheme and make a billiant death of 10 people tha would be hard to solve, until someone found his letter in the bottle...basically, he had a craving to kill and he wanted it to be a really big, unsolvable death, so he did it according to the poem of the ten little indian boys