Dude, ur entire statement is generalizing.
How do u ensure those who got the 'abortion' word pass through their mind is being irresponsible?
How do u ensure the father will walk away? How do u ensure the mother will resent and hate the child for that?
Even if u never heard or seen one, u should understand that,
this doesn't mean everyone who thought about abortion is simply throwing away their responsibility with or without the intetion of killing the innoccent life.

Lastly, not all child from such parent is so potential to be criminal.
U can say there are cases like this out thr, but parent with or without marriage still have to learn to take care of their child so that they can grow up to be someone better.
Therefore, the future of the child is depends on how the parent bring them, not according to what situation the child's life was there at the first place.

Well there are many pros and cons to this question.

If you legalize it, you can be sure that morality of the public will take a great turn, from conservative to liberal. Although you will have lesser rate in:

Baby dumping cases
Young couple divorce cases
forced marriage cases
etc

You will risk more of :

STD epidemic
HIV Spreading faster and at a higher rate
Morale of the society dropping
Teen being more irresponsible
and ofc, more innocent lives being taken away.

So, if you ask me. No it shouldnt be legalized. If one is thinking about having physical intimate intercourse then one should be mature enough to understand the consequences . There is no reason to say that you did it and didnt thought about what will happen next. Even the best reason is not the best reason at all to take an innocent life away, what more it is an excuse?

if we legalize abortion, remember, humanity are more worse than animal