I will have no problem explaining this to my 7yo DC. Context is everything. Save Ulster from Sodomy was a despicable campaign that demonised and terrorised our gay community. There are still people today who demonise and terrorise our gay community. Who brand them "unnatural", "unhealthy" and "deviant" because they have a very natural attraction to those of the same sex.
The fight for gay rights should be celebrated. From decriminalisation to same sex marriage. These rights were not simply given, they were hard fought and won.
And yes I do consider those who'd wish to damage it, homophobic. Because they are. They were homophobes before this window existed.