Suppose we return home to find a dresser drawer wide open—one we are certain we closed before leaving. Or perhaps a light is turned on in a room we haven't entered all day.
If we abandon the Law of Causality, we have to stop being investigators. The entire goal of human inquiry is to find the sufficient reason for what we observe.
We should be honest about what we are doing when we use the term "Brute Fact." We aren't offering an explanation; we are ending the conversation.
Calling the Universe a "Brute Fact" is like a detective walking into a crime scene, seeing a smoking gun on the floor, and concluding, "Must've been the wind."
It is an admission that we have reached a point where the cause is either too big or too uncomfortable to acknowledge, so we simply decide to stop thinking. But in reality, an "unexplained" cause is not the same thing as a "non-existent" cause.
If our biology and our math work, then everything must have a sufficient reason why it is. We cannot use the language of causality to build an argument while trying to deny that causality exists.