Good Intentions and Hindsight

I find it interesting that Kant would propose the idea that, regardless of the consequences of an action, as long as an action in itself has good intentions, it is "absolved" in a way of negative effects. Granted, I would NOT propose to say that he would believe that those who sought to do good and managed to mess it up with miserable consequences are entirely innocent, and that they are good people based solely on good intentions. That would be a logical fallacy (What d'you think about that idea though? ARE people absolved of consequences should their true aim be for the good of other people?).
But there's this idea in modern philosophy, which is likely bastardized in some fashion or another, about roads to terrible things being paved with good intentions. I'd rather not go on an exact quote about it, but you've likely heard of it before: People who want to do good but are willing to go about any means to achieve it are ultimately doing good with the wrong intentions.
So there's this interesting part of me that wants Kant to be right (I myself ascribe to Enlightenment thought to a fair degree; science and reason over spirituality and emotion), but I'm from a time where the idea of trying to achieve good and the consequences of the action taken being completely irrelevant seems sort of missing the point in some way. It's as if we expect to be able to expect the future and make educated guesses today, which I have no doubt that Kant takes this into account at length, but perhaps not for our purposes.
In my own personal life, I've tried to do good and respect possible consequences, by which I mean try to predict some of it by my previous experiences and learn from that. It seems logical to me, rather than impossible, to try and find a method for producing good from experience, not through some disconnected logical foundation. But without a logical foundation, I am blind, because my experiences and cultural identity want good from MY perspective. If everyone were reasonable by the standard of a firmly Atheistic person, nobody would experience the necessity of religious culture, which is not something new or recent, but has been around since human history was being recorded. We cannot possibly remove our own experiences and biases, but through scientific study (as Kant would observe, I imagine), we can create a kind of basis for true morality and ethics, rather than one based out of ourselves and what we are taught.
So here I am, fighting with myself, trying to reconcile the idea that doing good from personal experience and methods that can be tested will bring about good, but that I cannot ever remove my own bias about what good is or how it can even be good if I don't know what it is in the first place outside of my own definition thereof.

-Brian C. Rodgers.