However, what I was trying to convey is that voting is not inherently something that holds sway over anything. Votes are sort of like the currency of democracy, and like currency they need to be backed by something. U.S dollars are backed by the countries capacity to physically control strategic resources like oil, land, etc. (I.e., the U.S capacity for violently controlling resources), or emit soft-power (swaying other countries to their benefit).
Votes in a similar fashion are also backed by your ability to deny or inflict your personal power on the system you are a a part of. The clearest manifestation of that power being your ability to contribute to the institution as a whole. If we significantly reduced that capacity, or made it unnecessary for the continuation of the current system, then the power of that vote is reduced in-kind.
I would frame "withholding labour as violence" as more as labor flexing its power nonviolently. Violent action is also a way of flexing power, but more extreme.
> I also don't follow the logic that workers must use violence to enact change.
I think they need to use power, which is not necessarily violent.
> Why don't they just vote for change?
At least in the US, democratic institutions are dysfunctional and there are techniques the ruling class can use to neutralize the threat they pose (e.g. propaganda, divide-and-conquer). For instance, I think the combination of "culture war issues," [1] campaign contributions, and well-funded special-interest think tanks means neither US political party will take effective action to answer the threat of AI to the livelihoods of most people. You might see some campaign rhetoric and window-dressing bills, but nothing that will really threaten AI special interests.
[1] I think the practical purpose of "culture war issues" is to fragment the working class by alienating a significant fractions from each other. IMHO, if the Democratic party was serious about representing labor, it would call a truce on them (either significantly compromise or table the issues), but it's not serious, so they continue to divide.
That falls cleanly in the realm of a violent act, unless you disagree with that definition of violence, or my interpretation of the quote. I suppose you could interpret it as only applying to physical violence, but I don’t think anyone would agree that psychological or emotional violence simply don’t exist.