I saw someone trying to objectively define what the right and left is but their definition was so comically bad that it involved claiming both groups wanted "to improve society, just in different ways". That's not how it works people.
All that exists in reality is natural selection and evolution, which gives no shits about your political opinion. The goal of evolution is to cull the dysfunctional and prevent them from spreading and causing the whole system to collapse. Natural selection and evolution have given us systems like patriarchy because things like matriarchy...don't work for one reason or another. The one thing evolution does well is create lots of endless variables and throw them at a dartboard to see what works. This means lots of things that don't work will be created in the process.
Any organism that is incapable of reproducing (like lesbians or asexuals) are technically errors because they are defacto evolutionary dead ends. The evolutionary dead ends as well as functional products of natural selection are both equally selfish and form various interest groups. This is how you get the so-called "left". It's mostly a coalition of things like lesbians, feminists, neurotic jews, etc. What do all these groups have in common? They don't see themselves fitting into the mainstream evolutionary product. A world where they don't fit in is deemed useless to them, and thus they want to destroy it while attempting to spread their dysfunctional group in which they fit in, but usually has either no or decreased evolutionary viability.
Various factions move back and forth between the so-called right and left for whatever reason, but at it's heart, the left is a dysfunctional, antithesis of human, evolutionary dead end based on inferiority complex.
(img src: imgrum.org/tag/CarlTheCuck)