You have to ask them this question: whether you want accidents to happen all through your lives or not? Whether you wish to be bitten by poisonous snakes or not? If they say yes, it is their fate. If their answer is no, then only God is there as a Helper and as a Protector for them, wherever they may happen to be; and they are guided to the path of God. Only to admonish is anyone's duty; and there is no force in righteousness.