We've never really bothered trying to bring anyone round to the idea, as we know HE is the best option for our family at the moment, so haven't felt the need to explain or defend it really.
We've found that the advantages and benefits have become obvious to all (family members and friends) as time has gone on.
I've just realised that we haven't been asked about HE when out and about for ages, but the questions we used to get most often were:
"Is that legal?"
(No, we're on the run. Please just put our items through the till quickly, so we can pay and get back to the getaway car.)
"Don't you worry about socialisation?"
(Yes, it is a concern. That's why we took them out of school.)
Actually, once we say that we HE because the school system is abysmal at providing an appropriate education for dyslexic children, we are usually met with effusive agreement, and tales of other dyslexic children who are struggling in the education system.
And now the children are older, they are happy to engage in a discussion of the pros and cons.
So, we don't feel the need to justify our decisions, but we are happy to explain them to anyone who is interested.