I don't think saying "you're naive/silly/stupid for not knowing about this before, been around for ages etc"
Of course it has been around, of course people were aware of it, etc etc
But surely it's better to say "well done for realising the impact (and presumably preparing to get involved)" rather than "you're late you idiot"
Plenty of people have a realisation or reckoning of things at all different times. That's ok.
This is a really poor example/comparison. But I love classical music.
When someone (tentatively) says "So I listened to some thing called "Chopin" and I don't know much about it but it was kind of nice? Classical music is kind of cool no?..."
I say "oh yes! there's so much more to listen to, come in I am so pleased you're here"
not
"classical music has been there the whole time you idiot. what were you listening to before?? drake?"
As I say - very clumsy example and I am not comparing listening to Drake to Animal Testing, (!!!) but do you see what I mean? People discover things all the time having known they were there, it doesn't mean they care any less when they (eventually) have a moment?