They didn't lose the Left by publishing Hillary and the DNC's dirty laundry. The Left was pissed off about the DNC favoring Hillary over Bernie, and the leaked emails confirmed their suspicions. But WikiLeaks did lose a lot of support among Democrats - particularly those on the right of the party who favored Hillary. A lot of people mistake "the Democratic party" for "the Left."
But WikiLeaks did lose a lot of support among Democrats
They never had any tangible support among mainstream Democrats, even of the progressive faction, so they had nothing to lose there; the only thing they had to lose—and contrary to your claims they did lose some (but not all, the left fringe isn't a unitary hive mind) was on the left fringe. I suppose you are probably mistaking concern for the content of the early leaks with support for Wikileaks, but those aren't even approximately the same thing.
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They didn't lose the Left by publishing Hillary and the DNC's dirty laundry. The Left was pissed off about the DNC favoring Hillary over Bernie, and the leaked emails confirmed their suspicions. But WikiLeaks did lose a lot of support among Democrats - particularly those on the right of the party who favored Hillary. A lot of people mistake "the Democratic party" for "the Left."
They never had any tangible support among mainstream Democrats, even of the progressive faction, so they had nothing to lose there; the only thing they had to lose—and contrary to your claims they did lose some (but not all, the left fringe isn't a unitary hive mind) was on the left fringe. I suppose you are probably mistaking concern for the content of the early leaks with support for Wikileaks, but those aren't even approximately the same thing.
Bernie supporters aren't fringe. Treating them as one was one of the reasons Hillary lost.