Cause and Effect are facts. Reason is often a human delusion, but nevertheless, an important part in understanding. I believe in the infinite, and therefore, alternate realities, where every possibility exists in some corner of the quantum consciousness. In this, I also believe that we can observe and sense the connections that lead us to the conclusion of reason. It's part of how we make sense of experience, because we're self-aware enough to consider what might have been. This isn't a misunderstanding, but a step in our evolution.
When we seek out reason, we expose ourselves to the evidence of cause and effect. We become in tune with the dominoes that shape the reality we live in. It's really quite something, but often discounted. Yet, something that helps round-out our perspective. Not just because we feel connected to the world that affects us, but because we get a better picture of the effects we, ourselves, cause. Everything has an impact, because energy can neither be created, nor destroyed, and it's in our observations and explorations that we see how energy transforms.
So, I believe the answer is "yes" to the question: "Does everything happen for a reason, or do we look for a reason that everything that happens?" Everything happens for a reason, and we look for those reasons because we know they are there, and the key to evolving with them. We just have to believe in ourselves, our abilities, and to explore, and observe our individual realities. I believe reason is the understanding that keeps us moving. Our mistake is in thinking anything is mutually exclusive.