Weird question. I wouldn't be "ok" with someone crashing into me, you, family members or anybody else under any circumstances.
What I'm saying is, if someone crashes into me, and I find out they were stoned on pot (but otherwise unimpaired), I would not immediately assume it was the pot that caused the accident. I'd assume it was one of the usual reasons in any accident (distracted driving, or maybe just a bad driver in general).
If they were drinking, and their BAC was pretty high, I'd know for a fact it was a factor, and I'd be irritated with them. Much less so if they were a little stoned.
I agree that it's less than responsible to be out driving under the influence of any drug, pot, alcohol, narcotic pain relievers, lack of sleep, etc. It's also probably even less responsible to be texting than any of those other things.
That's why I said that I'd give a field sobriety test. If a person passes that, then they are fit enough to drive. If not, then they aren't and the reason they aren't (could just be lack of sleep) doesn't really matter much to me.