Bryan, when have you been slandered?
If you are a communications officer in an official capacity, you shouldn't be bringing half the stuff you do to the table. You should answer in a way that is factual and to the point. Your evasiveness is part of the problem.
Seriously, the thread where you were unable to phrase a response to possibility that children are being bullied by schools to force them to donate to your charity in a neutral but to the point way was disgusting.
There was no middle ground on that one. Whilst you can't comment on individual cases, if that is true, then your charity in no way condones it. Simple.
But you didn't. Because you endorse that kind of behaviour. You endorse using underhand, deliberately misleading (by omitting information selectively at the approach time) to manipulate a situation, where the people you are approaching are vulnerable to suggestion, and due to your overt and strategic use and shows of wealth and power make it even more difficult for those communities to turn you away.
To be transparent, you need to tell ALL people on EVERY interaction what your PRIMARY objective is. That is, you do not selectively pick one element of what you do, and then say "oh well it clearly says on the website".
Its a bit like an advert for a mortgage. Every time its advertised they have to put on the same page that your home may be at risk if you do not keep up with repayments. Why do they have to do it on every advert? Because its been decided by regulators that its such an important part of the transparency of the market and sales process (and the fact that the market couldn't be trusted to regulate itself). This helps to enables people to make an informed decision.
By effectively 'missing your small print' on occasion you mislead. Thats the issue.
If you want to go and do what you want to do then fine. But a lot of people think that you are not to be trusted and think they should regulate the situation, by providing the small print for you.
The solution would be for you to put the small print on every piece of literature, correspondence and presentation you give to schools, parents and the general public as a whole in order to be properly transparent, rather than be selective about it.