We can do whatever we want, but it might not be the right choice. God has given the people the Bible as the best guide for life. You can follow it or not, sin or not. Abortion is a sin according to the Bible. Just because we have free will doesn't make it right to sin, it's still wrong. We should try to stop sinning. However, not sinning at all is impossible. Everyone sins everyday, but as long as men repents for their sin it's forgiven.
God didn't gave us the Bible, men did.