Why do people ask questions without question marks.
First of all, why do we care, but to answer your question, I'd say because they got an "F" or a "D" in English. I think bad grammar is a sign of someone being a foreigner or someone who is uneducated.
You are right but we care because poor punctuation interferes with reading and understanding the writers thoughts. Who needs that?
To make it questionable...
I do the opposite all the time. I put a period after a question. Why do I do this.
Force of habit, I guess.
I don't know... but someone I know does that with every statement they write .. I find it strange , I think in their case they don't fully understand correct punctuation ..