It's a legitimate concern. People are stupid as fuck, and will shoot themselves in the foot. 

Using an old phone might be simple for us, but for someone completely technologically illiterate, having a purpose-built device is probably a better way to go.

You really don't need to be an asshole about it. 

 Are you two fucking, is that it? I'm being attacked again by somebody else who didn't answer my rather straightforward question. Me, the arsehole!? I wasn't attacking anybody. You want me to add smilies to my posts to make you all feel better? (Rhetorical. Please don't answer).