If I compare the amount of data I could have lost (or have lost) over the years, non-existent backups would have been way more fatal than non-existent RAID.

My post was maybe to strictly worded, RAID is nice and helpful, but it was responding to a claim that it is irresponsible to advertise a non-RAID device for important data, which is IMHO irresponsible itself, because it suggests that's all you recommend relying on.