Have you noticed in your life how accidents are not accidental? Sometimes it happens that even if you try very hard to define randomness as a mere coincidence, nothing comes of it? Sorry for the tautology, but the match doesn't match …
Troubles happen to everyone, but the question is - why are they happening? There are reasons for this, and by eliminating them, we get rid of unnecessary problems.
To begin with, Nothing is accidental. This world is arranged in a certain way, and there are Higher Laws that govern everything that happens. Ignorance, misunderstanding or rejection of these laws does not nullify them. We can say that Life is built on the principle of a school, where we must learn wisdom: to know the laws of life and live in accordance with them in order to enjoy every moment of life.
We live in a closed system, in which all its parts are closely interconnected with each other and have mutual influence, therefore nothing is accidental, and nothing passes without a trace. What you radiate is what you get. What goes around comes around. Only what you do to others comes back to you. Folk wisdom. The golden rule from Buddhism - "Do not do to another what you do not wish for yourself" - is built on the understanding of this. Other religions say essentially the same thing.
Why is this difficult to understand. Because life here has duration (time, inertia) and the "return" does not come immediately. When you launch a boomerang, it takes time to fly away, reach the end point and return; and while it flies, other boomerangs, launched before, return to you. Since the mind (in most cases) cannot trace this cause-and-effect relationship, there is no understanding that nothing happens by chance. Everything is interconnected and natural.
You need to understand that the troubles that happen to us are not a punishment from God (Higher Forces, etc.), but the result of our violation of these very Divine laws. In other words, I myself was the cause of these troubles. Taking this as a fact (I am responsible for what happens to me), you create an opportunity for spiritual growth: learning, correcting your mistakes and achieving the highest goal - happiness.
The Higher Laws are absolutely fair and harmonious (egotism sometimes does not allow us to see this). You are the reason for what is happening to you. You have to understand what it is like - what you do / did to others. This is the only way you can learn wisdom and get a certificate - happiness. Therefore, this is how this world works.
To be offended or angry at a person who creates trouble for you is a mistake that leads to strengthening of your own ego, which feeds on negativity. In this case, spiritual growth is impossible or inhibited. The other person through whom the trouble came is not the source of this trouble, but only its guide. Through him, Life points out your own mistakes, asks you to think, realize and draw the right conclusions. There would be no this person, there would be another, but the situation would have turned out the same.
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There is a lesson to be learned from troubles. Unless, of course, we want to repeatedly step on the same rake. If the same trouble comes into your life over and over again, this indicates a repeated step on the same rake. Life is trying to teach us something, but we all do not learn and do not learn. We do not think (preferring to blame others), do not draw the right conclusions and continue to do stupid things. Therefore, Life is forced to teach us with the help of more and more harsh situations. It can go far and be more painful.