The right/left divide has a lot of definitions but the one it feels right to apply here is the oldest one. Right wants to maintain and reinforce existent hierachies. Left wants to change them. Now, notice that there is an extremely well defined goal for the right, to maintain and reinforce the thing we all can see right in front if us. The left on the other hand, doesn't have a defined, unified goal state. Someone can be 'left' and want to bring down their current government in favour of an entirely different, maybe even more powerful and centralised state, or they can be 'left' and want to eliminate the idea of any person or group having authority over any other person or group. To use more modern examples, 'tankies' and 'anarcho-primitivists' are both 'leftist' insofar as they both agree the systems of places in the global 'west' should end, despite how little they agree on what should happen after.