There are a gazillion reasons why abortion can never really be made illegal.
First of all, no one else has that authority to make abortion illegal.
The woman has inherent rights to her body and life, and no one can tell her she has to be a baby factory for 9 months, and deal with all the pain and risk.
Governments do not have any superior authority over women, that would allow them to tell women what they can or can not do with their own bodies.
For example, making prostitution illegal is also exceeding the legal authority of government.
Any government that ties to assume these authorities is insane puritanical and religious tyranny that has to be utterly destroyed, as pure evil.
Second is that anyone claiming abortion is murder is obviously deliberately lying. We were all born and know that we were not really conscious of ourselves, until the age of at least 2 or 3 years. You could abort 2 year old and they would not at all care. They do not yet have sentience or consciousness. We all know that, because we can't even remember anything at all from under the age of 2 years.
Third is that human over population is about to destroy all life on the planet.
Humans have a very high reproductive rate, like rabbits, because historically we were prey.
Now that we no longer are prey, we have to reduce our reproductive rate so that we do not increase our population.
Otherwise we will use up all the water and resource, polluting and killing all other life on the planet.
Forth is that anti-abortion laws make absolutely no sense.
People are going to have X number of offspring, and whether you have them earlier or later, all the rest are going to be killed. It does not matter is you kill they with spermicide, abortion, or anything else. The point is all women have thousands of ovum, and almost all of them are going to die, no matter what, and they must. All abortion does is allow us as intelligent human beings, to decide how to optimize the offspring we finally do want and are ready for.
All anti-abortion laws do is force people to ruin their lives and their families, by excess pregnancies, too early. Humans are programmed to get pregnant by 13 so that the prey species would survive. But that is no longer necessary or optimal. And there is no way to deal with the conflicting instincts, other than abortion. That is unless we want society to subsidize these early accidental pregnancies?
There are an infinite number of other reasons why abortion is necessary. But this should be more than enough for now.