Even if they can vote equally, there's no guarantee that minority populations will have the numbers to protect themselves from the tyranny of the majority.

We haven't even gotten to the "equal access to voting" part here in the States yet, so we have a long long road before we get to the "voting is a good tool for minorities to protect themselves" phase.

Also, a jury needs a near-unanimous, or unanimous verdict to convict. All it takes is a few pro-lynching jurors, and the accused flies free as a bird.

For sure, but that's definitely not universally the case today.