This is, well, the word I dislike so much fits here well: FUD.

You have linked some strange sites and all that these articles state is... people work on the flu vaccine. Little information provided, a lot of alarming noise.

Well, humans are very healthy, aren't they?

Seasonal flu kills 291,000 to 646,000 people worldwide each year, according to a new estimate that's higher than the previous one of 250,000 to 500,000 deaths a year.

There is always Creator and morals and ethic some people claim they know better than others.

Of course, we should give up on science, as Creator knows better. It's easier for him to kill children without science:

The infant mortality rate started a long slide from 165 per 1,000 in 1900 to 7 per 1,000 in 1997. soource

In early-modern times, child mortality was very high; in 18th century Sweden every third child died, and in 19th century Germany every second child died. source

Like any tool, like a hummer or knife, gene manipulation knowledge and technology can be used to bring happiness or sorrow.