To a certain degree there have always been purely evil leftists, especially on the fringes of that movement, but I don't think it's been as bad in the past in the USA and West as it's getting now. I'm not talking about outright communists in the past. Of course they were always pure evil... but I'm talking more about what we'd call "liberal" people.
How can so many leftists who claim to speak on behalf of marginalized people see innocent people in Israel kidnapped, raped, and even killed. Babies, children, even grandparents who already survived one Holocaust when they were children themselves and just deserve to live out their remaining years in peace and safety... murdered and tortured... how can people see this and be on the side of the perpetrators? How can they take the side of the Fakestinians over innocent Israelis?
While some leftists are obviously evil like those people yelling "Hail Satan" to counterprotest pro life demonstrations, or people who burn down buildings in "mostly peaceful protests", I've always thought of most run of the mill leftists as generally meaning well but being very misguided.
They've been told that conservatives are these hateful, racist, misogynistic, nasty people who want to abuse kids, that conservatives hate anyone they disagree with, or who doesn't look like them, but we know that for the most part, that's not true. We see ourselves as believing in Biblical morality and supporting human rights from conception to the natural end of life. We conservatives are the ones who believe every human is made in God's image and therefore has inherent worth and dignity that goes along with that. We believe in basic moral behaviors. This is a far cry from the leftist stereotype of us... but leftists by and large really think we are these evil hateful people. So of course they oppose us and many can be "red pilled" as it were once they realize conservatives really aren't as bad as they believe them to be.
However there are a subset of leftists who aren't simply misinformed and just can't ever be red pilled because they really are evil. They are glad when babies are murdered in the womb or when someone gets euthanized. They even create pro-suicide forums to spread the supposed best methods to people. They love human death because it leaves more room for them and what they want. They believe we're all individually going to be annihilated in a short span anyway with no afterlife or hope of redemption and definitely no judgment from a righteous God, so they set out to extract as much pleasure from this life as possible through as much debauchery as possible with drugs, being as outlandish as possible, sex with any gender or age, etc. They also seek to push the transhumanist agenda chasing a dream of immortality which will be forever out of reach for them.
I think it's this subset of atheist/agnostic/nihilistic leftists who are so fiercely supporting the Fakestinian cause. Sadly this subset seems to be growing and becoming mainstream leftism, supplanting the well meaning but misguided let's love everyone types of the past with a militaristic and fierce nastiness. They want total human extinction if they can achieve it because to them there's nothing special or spiritual about humanity and they believe the world will be better off without us, but they want anyone with good or traditional values to die first.
This is what we're up against... people who have no stake in humanity's future as a whole and no belief in human dignity or right to life.