Almost all major states, including those with some level of democracy - be it franchise for all, for all men, for rich men or for some combination of the above - tolerate things they in theory ideologically do not tolerate. Today, we buy clothes made by hungry children in sweatshops, buy oil from dictators, condone violence by our troops and those of our allies on targets who may or may not deserve it. Yesterday we bought sugar from slavers and denied people the vote on colour and gender. The day before that we WERE the slavers. The day before that most of our own people were de facto slaves, tied to their lord's land, unable to even leave his lands without permission. The day before that we were subjects of a foreign power.
The difference is that the discrimination, violence, and forced labour move further from the centre. In the past, before we had machines to give our thinkers time to think, we had to use people to do their work. No coincidence that the first time in modern history the global primate power abolished slavery came at a time when machines had been built to do the work more efficiently. Even then, the sweat, tears, and blood of factory workers had to oil the machinery.
I'm certainly no Marxist, but I'm not blind to the fact that our and all civilisations have foundations of pain. It's what we do now they are no longer necessary that matters.
The truth is, in a world with both democracies and other systems, the democracies can outsource their misery. Even then, it is easy to ignore the failings in a democracy if it becomes a political football tossed around by demagogues. And most of our democracies are, to an extent, susceptible to demagogues (current political content redacted).