Here's a rephrase. You have to be understanding in order to positively influence people. Therefore, it's unproductive to be dismissive. Anti-scientific sentiment as phenomenon will not disappear, but will be shaped by that positive influence. It's misguiding to leave it at saying that the phenomenon will not disappear, because that implies that the groups in question are outside our influence.

Edit: if I'm still coming off vague, a sibling to my original comment says what I wanted to say more succinctly.

He's saying that there will always be anti-science people, but individuals who are anti-science will not always stay anti-science, so it is still worth putting in the effort to change their minds