> Science is not a religion it's a method to approach problems. There is nothing to be advertised.

The method is what needs advertisement. When it comes to something like conversion therapy or abstinence-only sex education the issue is not if it's the morally right thing to do or not, but that it flat out doesn't work to begin with. It fails to accomplish the stated goal.

> Emmanuel Kant was against the vaccine because he thought it further increases the already big population. It's very cruel but based purely on facts.

Doubtful. High risk of child death tends to lead to more children, not less. This is exactly what happens when you don't follow the science, but instead cherry pick your science facts to drive your ideology.

Few problems are well enough understood that it's only the ideology that makes the difference. Most of the time people are either willfully ignorant to the science or the science just hasn't well enough understood the issue at hand.