Where are leftists denying genocide? I’ve never heard a leftist deny a genocide, ever.
The reason horseshoe theory only makes sense if you don’t think about it is because it is entirely and completely surface level. A good recent example is that both the far left and the far right want to end the country of Isreal. So if you hear someone on the far left say “I don’t think Isreal should exist” and someone on the far right say “I don’t think Isreal should exist”, if you don’t think about it, you would conclude “wow they want the same thing! HORSESHOOOOEEE!!!”
When the reality is that the right doesn’t want Isreal to exist because they hate Jews and don’t want Jews to exist, and the left doesn’t want Isreal to exist because Isreal is a genocidal apartheid settler colonial state. The left’s viewpoints have nothing to do with the ethnicity of the people who live in Isreal, and the right’s viewpoints have nothing to do with the actions of the country of Isreal. Therefore any actions taken by the right or the left towards their statement of “I don’t think Isreal should exist” would be entirely and completely different. Although they’re saying the same thing on the surface, literally 1 second of thought is all it takes to realize “oh those are actually entirely different things.”
So if you think a leftist is denying a genocide somewhere and you start crying “MUH HORSESHOE THEORY” it just means you haven’t spent any time thinking about it. I bet if you did think about it you’d learn something.