Why are they doing it? Why are they using silly phrases like, trust the science? Which is basically the same thing religious people do, when they say have faith.
Also, science, the classical definition, has no meaning on its own. It’s simply way to describe reality. It’s usually up to engineers and people to put into practice.
The science may describe gravity, although they still can’t answer why the gravitational constant is a constant.
But, engineers and people can test effects of gravity everyday, and act accordingly.