Your claim is that there is manipulation of reddit. Manipulation implies that there is a 'non organic' illegitimate entity or group of entities working to exert their influence - a conspiracy to influence reddit. You are asserting that there are conspiracies to influence reddit and therefore you have a conspiracy theory and therefore you are a conspiracy theorist.
I could go on from here and tear down the other ridiculous accusation that I am maliciously 'shifting' the discussion, but this should be sufficient enough to encourage you to reconsider your position.
And yes, reddit is left of center and the left tends to be anti-Israel. What of it? Does that imply that there are no members of reddit that are not left of center? Does that imply that there are no people who are left of center that also are not anti-Israel? Does that imply that all rhetoric that does not strictly echo traditional left of center views is illegitimate?
More things to think about.