This is just an evolutionary process and humans used to kill just to survive.

True. But, we have long passed the days of hunter-gatherers. 100,000 years ago, we used to kill on a daily basis is different. We have evolved since then and we don’t need to kill to survive anymore. We can make better choices. For example, we can be vegetarians and take care of our food needs. In the example of mosquito, we can avoid killing it and still be safe from a mosquito bite. We have no need to kill it with a vengeance.