Right, as I've stated-- this is not an excuse. There may be explanations for bullying, but when one commits a transgression that has a victim there are real consequence (e.g. the example I gave of those excuses not standing up in court). I'm in full agreement.
What is really sad here is that your average not-so-strong kid doesn't stand a chance in a regular school. There is hardly any oversight that will give all the kids the feeling that they are safe in school.
My son is 15 and is going through a very hard time in school.
Where do you live? Have you considered a private school or (if you're in the United States) home schooling?
Some public school districts also offer the ability to take the last two years at a local community college: this option would also be great in terms of preparation for going on to a university.
Here's a program many of my friends attended (and have ended up earning their Bachelors degrees at universities like Berkeley and UCLA):