In order to remain serene, it is useful to be aware of the constant contradictions that any human offensive action to protect life or to eradicate it merely disturbs the very order of things and is, on the other hand, bungling, since everything is already in order.
Man is as much a prey to planetary beings as they are to man. Whether plant, animal, insect or bacterium. They all eat and are eaten. Why does man accept, without any fuss, that bird hunters eat mice, that large insects eat small ones, that aphids feed on plants and that plants occupy other plants? Because he has to. There is no other way. But man himself is just as organically subject to the cycle of nature as all other organisms. So instead of "birth control" of one's own species by means of a will and not by means of a natural process, so-called protection causes the very suffering from which so many people want to see themselves protected. By themselves, not by the natural order of processes from which man cannot protect himself "as a whole" anyway. Those who do not recognise this impossibility can hardly be helped to serenity.

Alan Watts writes:

For the enemy/friends of man are his pruners. They prevent him from destroying himself by excess fertility, so that a person who dies of malaria or tuberculosis should be honored at least as much as one who has died for his country in battle. He has made room for the rest of us, and the bacteria which killed him should be saluted with proper chivalry as an honorable foe.

The point is not that we should forthwith abandon penicillin ... : it is that we should fight to check the enemy, not to eliminate him. We must learn to include ourselves in the round of cooperations and conflicts, of symbiosis and preying, which constitutes the balance of nature, for a permanently victorious species destroys, not only itself, but all other life in its environment.

He does not suggest that the individual is to be left to his own devices.

The individual may be understood neither as an isolated person nor as an expandable, humanoid working machine. He may be seen, instead, of a particular focal point at which the whole universe expresses itself - as an incarnation of the Self, of the Godhead, or whatever one may choose to call IT. This view retains and, indeed, amplifies our apprehension that the individual is in some way sacred. At the same time it dissolves the paradox of the personal ego, which is to have attained the 'precious state' of being a unique person at the price of perpetual anxiety for one's survival. The hallucination of separateness prevents one from seeing that to cherish the ego is to cherish misery. We do not realize that our so called love and concern for the individual is simply the other face of our own fear of death or rejection.

I recommend reading the whole "The Book" from Watts.
I read it the third time and it always makes my day :)
Greetings to you.