Measuring the efficacy of MAP sympathetic messaging

[PorcelainLark]

I was wondering if anyone had studied shifts in attitudes based on exposure to MAP sympathetic messaging?

For example, if you were to take a random sample of people and ask them:
"On a scale of 1 to 10, with 1 being indifference and 10 being complete hatred, how do you feel about pedophiles?"

Follow this up with a second group that are shown messaging like "Nobody chooses to be a pedophile" before ask them the same aforementioned question, and see if there's a difference.

Similarly, maybe you could do A/B testing to work out which messages are more effective.

It would be useful to know what works.

What do you guys think?