I would probably explain it based on experience and people who've had success in BTC (and other altcoins for that matter). However, in your case since you said you're fairly new to this crypto currency, it would be best to explain based on what you've learned so far. The good thing here is, you don't have to explain in an effort to get them to believe what you believe in. It will be more of providing information and educating these people that you talk about. Whatever they do to the information that you provide is up to them.

When explaining to my co-workers or co-employees about bitcoin I always include its responsibility, since bitcoin is indeed also considered money even if its not physically like cash. People must still be able to properly handle its use. I also remind them that if they improperly used bitcoin to any no good reason they can still be held liable to it. So yeah its always an add on knowledge and lesson when teaching and explaining bitcoins to my office mates.