Let's take your examples of "Love, human misery and evil is a mystery".
It is only mistery for uneducated person, person who does not know mathematical source of natural laws and natural forces. Do not worry - you are not alone - majority of people are not educated in mathematical physics either - philosophers, theologists, humanitarians, and even some top scientists may be unfamiliar with mathematical symmetries or their mathematical consequences being natural laws and forces.
So, love: is just an emotion selected by evolution to survive better. Monkey (or other animal including human) who shows more love and care about a partner has higher probability to have offspring, thus the mutation which produces more love chemicals has higher probability to be passed.
Evel is a struggle against odds (with disorder) - and high power of disorder has strictly arithmetical origin. let's illustrate it in a simple example.
Let's say that we have a bunch of bricks to build a house. Let's place bricks in a box and shake it in order to get a house. There are many combinations of bricks we can get after a shake - and they are all equally probable. Out of them 99.99999...% will NOT be what we call "house", and only 0.0...01% WILL BE. That is why a probability of NOT getting a house is 99.99...% and the probability of getting house is only 0.00...01%.
And it is almost exactly like this is a situation with most odds - we simply are interested in only minor fraction of equally possible events.
I think, there is no need even to mention here another phenomena frequently attributed to supernatural: overloked asymmetry which may significantly shift probability. Classic example: dropped buttered bread - it simply sticks to the floor by sticky buttered side while flipping on the floor (and bouncing around). Drop it from smaller height - and if it won't have enough energy to roll and bounce on the floor, then the case will be much more symmetric and both sides will have practically equal odds.
Mizery of human comes from not understanding how things and universe work, and from evel - high number of states we label "disorder" versus very few we label "order" (see above).