According to Professor Lalich (Professor Emerita of Sociology at Pacific Standard), cults consider their ideology the "one true path", and share four characteristics:
They 1) espouse an all-encompassing belief system; 2) exhibit excessive devotion to the leaders; 3) avoid criticism of the group and its leaders; and 4) feel disdain for non-members.
It's not coincidental that this sounds like both Jehovah's Witnesses and members of the modern-day political left. Like the JW's, they have to meet regularly with their followers to rally and demonstrate against the latest outrage du jour handed down to them by their leaders. They feel like they are a "special group" of people following a very "righteous cause."
Like the Watchtower, they create common enemies, and try to separate their true followers from the rest of the "deplorables." Only they have the answers and can fix the problems. Anyone not buying the anti-Trump narrative are "apostates" for drawing attention to the media's obvious, blatant lies. They seek to brand them as "Nazis" or "racists" to shut down the flow of information that can discredit their leftist ideology.
Instead of breaking up families of members like the Watchtower, the left broke up families of immigrants under the leadership of Obama. However, quite literally, there are actual families where rational discussion of politics is becoming impossible due to the extreme "all or nothing" brand of Leftist ideology.
Cult-like supporters of the Left will eventually become disillusioned, and look for some other all-encompassing truth or charismatic cause to chase after. Video worth a watch:
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PS: Womp womp