IAmRoot

It's quite simple, really:

1. If everyone just agreed with me, we wouldn't have to spend any time on debate
2. Spending time on debate is time that could be used to prepare for the revolution
3. Not preparing for the revolution helps the fascists
4. Therefore, people who disagree with me help the fascists
5. People intentionally disagree with me
6. Therefore, people who disagree with me on anything intentionally help the fascists

QED

No, this doesn't work the other way around and compel me to agree with other leftists. See point 6.