indeed there are always people like that in this world, who want profit but don't want to learn and always rely on others. but the OP that you did was a good move that way they would think and learn independently.
Yeah, I'm sure Op had no bad intentions when he introduced his friends to Bitcoin but it only just happened that they are part of those set of people who are looking for where they can benefit from without having to risk anything at all.
This will serve as a lesson for Op so that whenever he wants to handle people that falls under this category next time he'll know how to treat them.