You've landed in Louisiana, 300 years ago and walked into town to see the slave markets.

The slaver has started the auction, and some of the wealthier landowners have started bidding on the hapless, bewildered individuals.
You have a fat sack of silver coins, and you're going to rescue some of these unfortunates, and bring them back to the future.
They'll be huge celebrities and live out their lives in safety and luxury. They're going to love it, and you're going to be a hero.

First, you have to buy them, though.

You have to buy human beings, as if that's actually possible. Not just that, but you have to buy them from a slaver, who kidnapped them for this very purpose, and for whom each sale is also an order to sail back to Africa for more.

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Each silver coin will help him buy stores, munitions and leg irons.
Each profitable sale attracting more captains, vessels and crew into this ghastly 'trade'.
You can make a massive difference to any people you buy, people you'll come to know by name and face; but you also know that long after you're gone, the vicious, brutal trade in human livestock will continue, except now it will continue with your sanction and your financial support.
It will enslave people you will never have a chance to meet, people's who's fate and identity you can only deduce.
The slaver doesn't care if you bought them to work a plantation, to eat them alive, or to transport them 300 years into the future.
To him, you are exactly the same as any other slave owner. You're a paying customer, and that's where his interest ends.

One option is to buy as many slaves as you can, and give them the best life possible.
If you subscribe to the mentality that, 'Somebody should do something', then you're probably not going to hesitate. This is particularly appealing if you're drawn to measures and metrics.
You can definitively measure the positive outcome of your action. The exact number of people rescued. Exactly where they lived, how old they are, how healthy they are, languages spoken, relationship to each other etc.
If, on the other hand, you believe that you are responsible for all of the consequences of your actions, both the seen and the unseen, the measurable and the immeasurable, then you'll walk away without bidding.

Before you do so, understand that several things will happen.

Those who would choose to buy the slaves will consider you greedy, and accuse you accordingly. They'll say that you're just as bad as the slavers, prizing your own wealth above the freedom and well being of your fellow man.

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If you denounce slavery they will accuse you of hypocrisy and point out that you turned down an easy opportunity to end the enslavement of a dozen people, by just opening that sack of silver. They'll say that if you really hated slavery, you'd reach into your pocket, engage in the trade, and try to improve it from the inside.

While they're looking at the fate of the people, you're thinking of the fate of the coins.
You recognise that the money doesn't cease to exist just because its no longer yours.
Your purchase would commission the capture and imprisonment of many more Africans than you've rescued; attrition being so high across the Atlantic that there are two people kidnapped for each one who survives to stand on the auction block.
You'll be unable to offer any measures or metrics. You'll never know the exact number, age or demographic of the people who won't be kidnapped.
You can deduce that they are numerous, but you can't know, so the people who care about measures and metrics can only quantify the people you declined to rescue, and they'll despise you for it. They'll say, "What have you done to fix it?", as passionately as they declare, "Somebody should do something". Predictably substituting activity for productivity, while mistaking abstinence for apathy.

Please don't support the state with your vote.

Walk away from the booth. Government isn't broken.
It's intrinsically bad and belongs on the scrap-heap of history, right next to chattel slavery.

Have a fantastic day