The problem lies not in that you are wrong in concluding that these people are adherents of leftists ideologies (most are), but that you are falling for the pars pro toto fallacy: people who think that 'master' is an offensive word to use in a source code repository are 'left/liberal', thus all or most of 'the left/liberals' are such people.

You are saying 'this group thinks' as if all people who would identify as adhering to leftist ideologies (from the extremes to common social democracy) act like this. You are trying to stuff people into boxes: you are either team A or team B. That is polarization; something we can sorely do without.