Whether right or wrong, they have definitely provided a counterbalance against democracy. The Court has stood for what it believes are the rights of people who are unable to participate in democracy because they have not yet been born. They are, in the eyes of democracy, a minority of zero, though they number almost a million per year. Whether or not you or I agree with them, they have acted as a check on democracy.
A “monitory of zero” clearly has no need to be protected by a legal system.
Just like we don’t legislate that you can’t kill plants for the sake of the plant, a fetus spends up to 18 weeks in a non-sentient state where it has no subjective experience. It doesn’t need protection since a non-sentient being can’t suffer.
Edit: it’s also worth mentioning that many abortions happen at the zygote or embryo stage, before there is even a fetus.