Given: 1) a system in which either party A or party B win by small margins, and 2) a group of people who votes overwhelmingly for party B.
Let's think of options to increase election win probabilities for party A.
One option: legislate laws and bring about a justice system in which that group of people are disproportionately imprisoned/fined/etc and made to lose voting rights.
Unsurprising result: party A has higher chance of winning elections.
Problem: current system incentivizes politicians in party A to enact this option.
How to stop this option: give voting rights to everyone including felons.
What's systematic in the justice system that disproportionately imprison a specific group of people?
As a black person who has been stopped more often than my white peers because I look like an immigrant (in Europe though), systemic racism is just marketing, there's no systemic racism enshrined in law in any Western society.
Sure, some individual may be racist, even if it's hard to say whether someone is racist or he's just afraid of the statistics, which prove some groups indeed harm police officers and other citizens in disproportionately high numbers.
Things would be definitely better for everyone (minus the cartels, I guess) if it wasn't for the war on drugs, which makes poor people into criminals.
And things would be much better if some groups weren't specifically targeted in the 60s and given benefits that incentivised fatherlessness and broke the family structure.
It's a huge topic, so you can look up Thomas Sowell on this.
Let's think of options to increase election win probabilities for party A.
One option: legislate laws and bring about a justice system in which that group of people are disproportionately imprisoned/fined/etc and made to lose voting rights.
Unsurprising result: party A has higher chance of winning elections.
Problem: current system incentivizes politicians in party A to enact this option.
How to stop this option: give voting rights to everyone including felons.