All we cando for them is to convince and try to help them out to earn on bitcoins.If they didnt like what we are going to offer to them then it is not our loss.Only people who crave to earn online is going to use bitcoins if they dont have interest on it then we cant force them.They have their own decision
If somebody dont like something is just because of less interest and weak knowledge. My suggestion is in the favor of people who think that if something is wrong in people's view let them learn about it and to learn something you should help them by showing right way and true / actual value of bitcoin. If may help them to like bitcoin and to create their interest in it slowly.