I hear this a lot, but isn't evolution trial/error? Just because we can say it's not in an organism's evolutionary interest to evolve a certain way, doesn't mea

I hear this a lot, but isn't evolution trial/error? Just because we can say it's not in an organism's evolutionary interest to evolve a certain way, doesn't mean it won't "try" it - at any stage in it's evolution. Also I don't think an organism has any active role in deciding what mutations occur, regardless of it's interest.