I think not only newbies made mistakes about you've mentioned above but also the users in higher ranks. Even though they are in higher ranks but still they made mistakes. But as you shared this kind of idea well maybe it can be prevented by all users in bitcoin. And it only depends to the users if they want to made that things even they already know what's the result of it
While someone joining the forum in this week is a newbie the truth is we are all newbies in whatever activity we have not done before, in fact I remember that about 6 months ago I changed from a web wallet to electrum, I was about to send a transaction but I was unable to find where to change the fee and I spent about half an hour trying to find it, so like you see we can be inexperienced in lots of aspects of our lives.