. . . for a reason. But even if there is no reason, they still are as they are. Accepting this is what matters. Then, if there is reason, you might get to see it.
Check out (look-up) Leibniz's greatest epistemological maxim ever -- the principle of sufficient reason. "For every true state of affairs or true proposition, there is an explanation of why it is the way it is and not some other way."
Things are as they are. Allowing what is creates a space around what is. That space is presence and out of presence comes awareness. It becomes much easier to see, if one chooses to look, how things that were previously hidden affect what happens. This is not the important thing of course. Creating the space is. That space is conscious awareness, not thought. Once in space consciousness there is no longer a need to think. Zen.
By allowing things to be as they are, accepting that what is there is as it is meant to be, without judging it, creates space around it. That space, or presence, brings the moment into view as it actually is. No stress, no need to, no have to, nothing wrong, it just allows it to be and reveals what is really there. This space is free from thought because there's no mind there to think about it. An opening occurs into a peaceful state where all things come from. Free of resistance from wanting something else, deciding something you don't agree with, what ought to be. There is no you. There is no ego. There is only the now. If everything is as it is, then it feels absolutely right. It is only when the judgmental mind comes into play that it might be defined differently. Anything that doesn't feel right, by definition, feels wrong, and seeing it as wrong creates a resistive mind that takes you out of the moment and brings the critical mind into play. By allowing things to be as they are FIRST, without deciding something about it, a state of Zen arises, which is not a state of no-mind as many think it is, but a state free from having to think. No longer needing to. Nothing compelling it. Stillness. Experience that reality and see.