Do we continue to charge these boys or simply back away?

Hi ladies,
I’m really needing some advice here. My son has ADHD and ASD. Im from Australia so we may have different policies and procedures etc. I’m unsure exactly. But my son (12) was bullied for a year straight by the same two boys, who often would drag other boys involved in this. My son has been physically assaulted, stalked and harassed. At one stage, one of these other boys brought a knife to school and tried to stab my son. That same boy tried to stab my son with a fork in the boys toilets while he was using the urinal. He then continued each day stalking my son in the toilets and making comments about his penis etc. At one stage there were multiple boys on top of my child trying to bash him. Even other parents intervened to get those boys off of him.
Long story short (well, not really short but that’s short for last years recalled events 😪), it got to October last year which is a whole 10 months of putting up with this, I decided to go to the police. We made a report and they said they’d pass the report onto whoever was in charge.
3 months later!!!! I received a call just yesterday, asking if my son could come in and make a statement and we’d see where to take it from there. Meanwhile, because it’s been 3 MONTHS, a lot more has gone on. Now the boys have started high school and if I thought it was bad before, it’s incredibly BAD now!
My 12 year old started high school, only to already be a target of not only these boys from the primary school, but they have older, more violent friends 😳
They were all out for blood the moment they saw my boy at high school. They rounded up at least 30 other boys of all ages (ranging from 13-16 yrs old) and they ALL were trying to bash him! 😰
At this point, my oldest son (15) saw what was going, notified staff and ran across to his little brother. My oldest son (who has never even had a detention due to being focused on his grades and simply not interested in bad influences) stood in front of his brother while 4-5 other staff members also tried to control the mob of violent young men.
This was the last day that boys have attended this school and when we went to make statements yesterday, we added all of this recent information to the statement. I also will admit to not being completely innocent, I did make a post that stated ‘had my son been seriously injured by 30 or more kids, I’d probably charged with murder myself’.
The police gave my son a choice because there has already been many assaults, to either press charges or give a caution to these boys and their parents before charging them. My son, being a kind soul, decided to just give the caution first and if they still target him, he’ll charge them just to keep them away and finally live in peace.
Today I receive a call from the officer who took my both my sons statements. Apparently, the mothers of these so called “children” wish to make their own complaint against me for saying I would’ve wanted to harm their children if my son was seriously harmed by their children 🤔
And apparently, now I can be charged and the police are taking my post more seriously than actual assaults and much more inflicted on my child. The school have also tried to bribe me to move my son just to avoid the drama 😱
I’m moving both boys but I feel as though these boys can’t just be making everyone feel as though they need to run away. My son is considering pressing charges still and the police have said it’s still an option. But I’ll need to also have the consequences for the figure of speech I used in my post. I’m trying to show my boys to have faith in the law and making the right decisions. Unfortunately, our laws aren’t giving any young person any hope in that belief.