I wouldn't get an abortion myself, but I think it should be legal, partly to prevent cases like the ones below.

Savita Halappanavar had an incomplete miscarriage, but since removal of the dying fetus was considered an abortion under Irish law, doctors could not remove the dying fetus and she died of sepsis.

Bei Bei Shuai attempted suicide, lost her unborn child as a result and was charged with murder & attempted feticide.

Christine Taylor fell down the stairs and was arrested for attempted feticide when she went to the hospital.

I also think people underestimate how hard pregnancy and childbirth is on a person's body. There are a lot of possible illnesses that can occur, and time off to recover often means losing wages. While it's not legal in the US, that doesn't stop people from trying to fire pregnant employees.

While it's true that adoption is an option, it's also traumatic and has been used as a tool of cultural genocide, and personally I would rather have been aborted or left in a dumpster than adopted.