I guess it depends on the crime. I feel teens are kids but if they commit a crime like murder, rape, mulesting a younger child and have no remorse of there crime then yes i believe they should be charged as an adult. But on the other hand they are still kids and mature differently. Guess thats a hard question to answer.

Sometimes I believe that no matter how you raise a kid they will form their own belief system of 'right and wrong' and tailor it to their own wants. Then they grow a little more and realize that the universe does not revolve around them. Positive reinforcement of good behaviors and consequences for bad behaviors is the thing in my book.
Teenagers are still kids, they should show respect for EVERYONE, not just adults. They are, however, old enough to know right from wrong and I honestly do not know many kids who do not know the difference and if someone continues to behave badly then they are not learning and need a 'lesson'.
Increasingly more bad behaviors are arising because there seems to be no boundary for a juvenile offender. Courts are lenient, because they are still children, and then the kids go on to push even the system to what they actually want/need to see as a boundary. Oftentimes it's the kids who lack boundaries at home who end up in the juvenile justice system.
One case in point is SD, she's currently in a secure juvenile detention center where even there she has some say in what she can and cannot do! She commited felony assault and was given a sentence of two years, or complete drug court and be released and her record sealed. SD failed drug court so she was revoked and her sentence commenced. Some kids learn quicker than others I guess! Ironically SD said that if they'd 'thrown the book at her' first time around she would have behaved differently....
Back to the trial of kids as adults. I believe that they do all manner of evaluations on a child before they deem them fit to be tried as adults in felony cases. Some kids never achieve any sense of morality and have no remorse for what they do so they really are better kept behind bars! I honestly do not believe that there's any rehabilitation for a sociopath.
Kids learn all the time and extended families, schools, society and churches all consistently teach right from wrong so, by age 17 and even with remiss parenting, it's a fairly safe bet that they have learned the differences between right and wrong, so they get to go to adult court for offences committed. If they have not learned the differences then there's cause for concern...right??

It's really a moot point b/c if kids WERE treating adults with respect and others around them (unlike the narcissistic socipaths with zero human empathy due to being free ranged) they wouldn't be committing such heinous crimes against humanity.

Back in the old days you could not have your cake and eat it too.

As a child you were expected to respect others. . .if you did do a crime as a young person, you were tried as an adult. Because the expectation was that you knew right from wrong from a very young age. And rightly so.

Children today do know right from wrong. They are let off the hook so many times that they'll continue to do whatever misdeeds they can GET AWAY WITH. Adults are fools to think otherwise.