Science is not a monolithic "method" that can be applied across the board to deal with questions all the way from whether there are four bonds on a carbon atom to the question of whether your wife is faithful, or when abortion is justified, or whether it is wrong to inflict pain on little children for your own amusement. There's no magic pill that will make us stop the tendency to believe what we prefer to be true, except being aware that wishful thinking is possible and considering that when you think. C. S. Lewis's analysis of the "wishful thinking" argument in "On Obstinacy in Belief" still stands as a brilliant reply to this whole line of thinking, a response that has gone unanswered in infidel literature, so far as I can tell.
Some subjects are experimentable, and some are not. Even when they are experimentable, scientists who hold the theory that "loses" the experiment don't just give up on their theories. The adjust their theories to deal with the negative experimental results, using auxiliary hypotheses. In fact, they can go on doing this forever if they feel the need to. They usually quit when they die off. It's a myth that Michelson-Morley caused a complete and immediate abandonment of ether theory. So there is no such thing as a "crucial experiment" in science. That's just basic philosophy of science going back to Pierre Duhem.