This is true, the left deploys these evil ideas like "science" to brainwash you into believing their "actual ways to improve people's lives" it's devious.
There is legitimate honest it-really-exists propaganda put out by folks to the left of John McCain. PETA is a real thing. The Sierra Club is a real thing. The ACLU is a real thing. The DSA is real.
But the deck is stacked when you assert an advocated policy needs to be some kind of cosmological truth. I don't need "science" to tell me that Trans-people deserve equitable treatment or that shooting your 11-month old dog in a gravel pit is bad or that billionaires shouldn't exist. These are decidedly political views.
What's more, when I advocate for a position, I'm not going to argue "fairly" with a bigot, a dog-murderer, or a plutocrat. I'm going to make my strongest points and my hardest digs, then leave the opposition to make its own case. Given that I'm being outspent $1M:$1, I don't feel any need to develop a case for the TERF or a South Dakota governor or the megalomaniac profiting off lead paint sales on their behalf.
You don't need to be objective. You can have an opinion and still be a good leftist. You can even make a passionate, moving case that's intended to grip people on more than a purely logical level.
Don't let the right-wing asshats scare you away from showing your humanity when you're engaging in progressive politics.
I'm sure this meme is aimed to the US but "the left" is very broad from where I'm from and I don't see any "science" in their propaganda to be honest. And improving people's lives is very subjective and have various interpretations. Let's just hear everyone from all political spectrums and vote about it shall we?
I know my damn son went to college and started liking black people just because he met some and realized that they're human. Started believing in science too!
Years of my hard work instilling traditional values, all for nothing. Goddamn leftist brainwashing.
Most people probably don't think doing anything based only on race is very good anymore. Unfortunately if you keep to a totally homogenous group, use only negative language to describe another group (like black people or hispanic people being this or lazy or entitled or weird names or bad music or whatever), and only associate people from those groups with causes or ideas you feel strongly negative about (BLM / border walls / etc)... You are still providing some good old fashioned indoctrination to that effect. That behavioral training will stick much deeper than any message you might give about not seeing color or similar. It's easy to get really sideways really fast with tribal behaviors, since that's sort of the main human distinguishing thing.
While prejudice does happen, simply getting to know the person basically destroys it completely. It's more of a problem in policing, hiring, etc. Things that require assumptions about people to gauge important situations