Science - A Menace to Mankind?

Since the "successful" progress of science, from the theory of evolution to the development of super computers, many people have developed the concern of whether science is really a help or menace to mankind. People have critisized science from a great variety of ways, from biology to physics to chemistry, science often appear as something negative that often result in a dystopian society or as the reason of mass destruction on Earth.
Just as an example, many books and films often depict the future world in one of the three basic situations:
1) Technology is so advanced that
a) It takes over the roles of humans completely
b) it is even more advanced that it takes over the human race, leading a minority of humans left, or controls over the humans and became the world's ruler
2) Biology is so advanced that
a) Every human being is simply created through cloning or test-tube experiments
b) Somehow a deadly virus that is horribly contagious is realised into the world, resulting in the majority of the people either dead or deformed.
3) Chemistry is so advanced that
a) Humans are simply made from particles (which in a sense even worse than cloning)
b) It is frequently used in warfare for victory (normally the use of biological weapon is more often)

So people question the purpose of science altogether because of the possibilities that science can be used in such immoral way.
However, I do not agree to what these people feel about science. Yes, because of science we are now in the nuclear age. Yes, because of science cloning is made possible. But, we should also consider what "good" things science have done for us. Because of the development of science, we can communicate through more alternatives other than letters, although this does not mean that we no longer use letters as a way of communication, as some people who ironically use the internet themselves. Also, the progress of science made what originally thought to be the "uncurable dieases" curable. Whenever you go to the hospital for something as simple as a cough, imagine what people may have to go through hundreds of years ago, where even a cough will need complicated and sometimes bizarre ways to treat.
As many people realise by themselves, humans are mostly made up of pessimists who see the world around them filled with danger, thus they would rather critisize on the bad side of science than the good side. Also, human beings have a natural urge to be recognized, thus the fear of being dominated by machines which they feel are not alive.
Science by itself is not the menace. The main culprit is the humans behind the scene. I feel that science by itself is sacred, because it is a mixture of all the most basic knowledge that no matter humans want to deny its existence or otherwise, still exists in various ways. The main reason why people are afraid that science would be a menace is because they are afraid of some people who will make use of science out of greed, which often result in the rest of the world suffer due to that few people's greed. On the other hand, a person who makes use of science in order to save people's lives would be hailed by the public.
For example, Alfred Nobel, then inventor of dynamite, invented dynamite in order to help people to clear mountains in order to buil railways. However, people found that dynamite, being so detructive, is able to be used as a weapon. This shows that the original intention of Nobel is good, but there are some people who made use of the product to achieve other purposes that is evil. This shows that the main issue is not science itself, but the person who is making use of it, of what he is using it to do.
All in all, I feel that science by itself is not a menace to mankind, but instead is the people who are using science to achieve a certain goal who is responsible for what will happen if science is being used that way.