Monty, you hit the nail on the head with your own quote
Life experience is only relevant in the field(s) that you have actually had experience
That is what the whole argy bargy has been about, teenagers refuting the statements of persons who have practical experience in the subject, often on subjects they obviously know little or nothing about, other than what they may have read, or heard. I haven't seen too many teenage golf, tax, or similar "experts" being "beaten down" on this forum. Generally the subject matter has been something that it is patently obvious that the person knows little about.
I have not seen anyone here professing to be "an all knowledgeable guru". Most of the subject matter here is military related and I think that the ex service members would have a better grasp of the subject than persons who have not served regardless of any prior knowledge.
Profiles are a moot point. But, I'll give you a practical example of what I am getting at regarding military service and military knowledge. About 8 - 10 years ago I attended an ANZAC day march in my capital city. After the formalities a group of us Navy blokes went to a nearby pub where we met and talked with a group who intrigued me a little, Veterans of the French Foreign Legion and several army bloke already with their group.
Almost all of us were unknown to one another coming from different services and having a wide spread of ages. Now as you can imagine in a group like this all telling stories, a fair amount of truth suffers at the hands of a good story, you may read "bullsh*t if you wish.
After about ten minutes one of the German ex Legionnaires stated to a bloke who proclaimed to have served in Vietnam, "You are a phoney" and several others immediately jumped on the bandwagon having had their suspicions aroused but said nothing. To cut a long story short the cops arrived and he was questioned and found to have been the son of a middle grade Army officer who thought that although he had never served he might like to pass himself off as an ex serviceman. He had lived on Army bases most of his life and thought that he knew the routine, but it only took a few minutes for a complete stranger from a completely unrelated service to catch him out.
Yes, it is very easy to fake your Profile, but it won't be long before someone smells a rat. It is perhaps unfortunate that on forums such as this, some persons tend to exaggerate many things, experience, stories and sometimes their personality. This is no great hassle, there are also persons who seem to use the majority of their posts to cross examine the motives and veracity of others without actually contributing much in the way of informative posts, but I'm sure that we all know in our own mind who they might be and judge their writings accordingly.