"I do suspect that vaccines, being as they are prophylactic and administered to children, are probably subject to rather more scrutiny than other drugs."
So you think they are a special case? That under reporting of ADR happens but not in relation to vaccination? Or do you accept that vaccine reactions are also under reported, just like other ADRs?
You still haven't said what you consider to be 'valid'. Would you like to share some examples? There are plenty of people on this board who can tell you about their experiences of doctors dismissing their concerns about vaccination. You don't have to look too far to find them unfortunately.
Seeing as vaccines are grouped under ADRs - how would you like me to separate them out? You seem to be assuming that they are a special case that is not susceptible to the same issues with under reporting. I'm wondering why? Does it worry you that vaccine reactions could also be under reported to such an extent?
If you're not looking for evidence of toxicity it may be hard to find. That paper identified two areas that they admitted they don't know enough about. Do you think you know something that they don't?
I can understand why someone would use that argument as well - it's the only thing that they have information on and it gives the impression that they have looked into it and found it safe. Some people find it reassuring because they don't realise how different the levels of absorption are.