Firstly, I do not think that scientific knowledge is absolutely better than other types of knowledge. I believe that we can only talk about better or worse in the context of specific situations and circumstances, not in general absolute terms. Secondly, I do not believe that the critical, analytical, impersonal approach can be used to deter people from sacrificing life for the sake of knowledge.
Many people find that analytical and critical thinking serves their purpose.
I myself find it useful in certain aspects of my life, as do the majority of scientists. However, I disabused myself of the idea that this approach is the best approach several years ago. Though Popper encourages us to be critical of our ideas and find their flaws, he seems to consider the critical approach as beyond criticism. And vice-versa, the new speck of colour in its turn affects the whole. Everything is changed by it, everything becomes different, better or worse.