There are reasons for it's being "abolished" in a born-again believers life, and it is not these or "this": "so a person can behave themself any way they want to and still be justified." That's not it at all... Your missing the point and the real purpose of the law...
"Abolished" can mean "finished, done away with, or completed, or true intended purpose complete or completed, and now it's on to something else, anyway...
Their is still a purpose for the law, so it is not entirely done away with yet... but not for the "born again Christian", for them it is already done... Becomes "past tense" ect... "Passes away", ect, (like Paul says)...
After Judgement Day, and during the thousand year reign of Christ and (some) of his people at that time on earth, the law will be completely done away with at that time, after the judgement, cause that is what it is and what it does... And after that it no longer has any more need or purpose...
The law was never meant to save, nor was the law ever meant to show us "the way" or path to Salvation (found in Jesus, in the NT, NC)... The law that you refer to, was only meant as a lawgiver and judge, and in that judgment to pronounce us guilty, but beyond that, nothing else, it leaves you there, nothing added or continued from there, and beyond that, it's purpose is done and completed and over with after that... anyway, nothing added or continued, or no continuation from there, until you get into Christ and the NC... It is continued from there...
And/but, if you don't start from there, I think your a "wolf in sheep's clothing", just me and my opinion...
God Bless!