There is no "do your best" or "try." Would you fly with a pilot who has a history of crashing? Would you say "well, he just needs to try harder." Or "at least he's more humble than other pilots"?
“Whoever causes one of these little ones who believe in me to sin, it would be better for him to have a great millstone hung around his neck and to be drowned in the depths of the sea. Woe to the world because of things that cause sin! Such things must come, but woe to the one through whom they come!" (By the way, this is the sin of scandal.)