Not sure you should be trying not to scare them. I wouldn't be fear mongery, but this is their world. They need to know what those fast bits are costing them. They'll probably chose the fast bits anyway, but they deserve to know the cost before hand if possible.
If this were the US you'd need to prepare for heartbreak as you realize they just don't give a damn and you can't scare them. This would terrify the few who understood you and were scared. They're already terrified.