By making murder illegal and punishable in a court of law. The goal is equal opportunity, not equal outcomes. Bad things are still going to happen, abuses will always happen. The goal is to minimize the risks and to ensure a punitive response to unlawful behavior.
The goal being to maximize your ability to enjoy your freedoms does not mean you'll be able to maximize them as much as someone else with greater assets.
An example would be public parks. A wealthy person may be able to put a giant boat on the lake, but you may only be able to afford to swim in the lake. You should still be allowed to swim in the lake and enjoy the park.
You, the individual, are still responsible for you. Equal opportunity doesn't ensure equal outcome. So, we must still protect the commons and have a strong social safety net.
Unlike most libertarians, given the power to do so, I'd tax the hell out of the wealthy. For the record, I'm considered wealthy. I pay a lot of taxes, but could easily pay more without even really reducing my ability to enjoy my freedoms.
It is my responsibility to help pay for your social safety net. Not only that, it is financially sound for me to do so.
I want you to be healthy, you're more productive. I want you to be educated, you're more innovative. I want you to have the ability to try to start a business, so I can sell your business products and services. I want you happy, because happy people are more productive. I want you to not have to worry about health care expenses, because keeping you healthy is less expensive than fixing you up after you become unhealthy.
It's just good sense, I think. Killing you is still illegal and no system is going to recent that. Laws aren't really meant to stop people, they are meant to indicate those actions will be punished.