This isn't about blame, no one is looking for a scapegoat, you're just being unreasonable about it. Going by your logic it's OK to be told the wrong time then have a random person lecture you later for being told the wrong thing.
Responsible? It's just a CPU, not everyone can or wants to spend time on a forum double checking information they have on reason to doubt.
What I find odd about your argument is you're insistent they should have gone off and checked the information again but why would they doubt the information they've been given? I only found out because I'm reading these threads, without that I wouldn't have known and would have gone off the information I already had.
No need for petty one-upmanship, I only clarified I have one on the way so you couldn't argue I was just saying these things because I missed the window. Don't get so wound up over some bits of kit.