No, I know, but it is the repeat insistance that SN can be caused by those factors that's derailing the thread somewhat.
Those of us who are in the system know what leads to a family being considered difficult when it comes to EHCPs, and it's usually those of us who are pushing hard for our children, not the ones with a background of drugs and alcohol. This is what pp are trying to say.
Most of the people I know whose children have diffiuclties, but not quite enough to make it obvious to others, have become difficult families, you have no choice, the only other option is to give up. Would you give up on your child? I doubt it, but in certain circumstances this is the very thing that would make you a difficult parent.
"Anyone who thinks autism is caused by things like being an only child is an idiot."
Yes, you're right, but I could give you the name and job title of the very person within our ASD assessment team who said these things and more to local families (obviously I won't!). They may be an idiot, but these opinions are wide held and not uncommon. This is what parents like me are up against, this is why we become difficult. Would you accept "only child" as a reasonable explanation for your child's difficulties? This is why parents can become defensive, because of the attitudes we face, and the judgements made against us, not just from members of the public, and uninformed family members and friends, but from professionals, people who should know better than this, and yet here we are.