Love never takes sides. If someone you would die for tells you that they are gay, you would not bang them over the heard with Bible verse and what God thinks. Who knows? I think the criticism above is very harsh.
It would help to have a clear 'this is wrong' instead of a sort of 'this doesn't work, afterall we want to convert them' attitude. I encourage you to read Wesley Hill's blogs and his book "Washed and Waiting". First they have questions, then they make fun of it, then they start seeing me as a person.
Those who participated may have been more comfortable in discussing their private lives with the researcher or in accessing support.