No, it doesnt. While those like OBL may find those willing to execute such terrorist attacks, those you describe hardly have the means to accomplish it on their own. Thus they get used by those like OBL as part of a plan. Thats simply not the case in regards to this soldier.
Yes, they need the support of an organization, as I also mentioned.
Again, this doesnt remove the political goal that those using terrorism attempt to accomplish. Point being not all crimes comitted by those with personal grievances would be terrorism either.
Fair point, it is not, by itself, enough for being described as a "terrorist": we all understand those to have some kind of agenda, I believe.
No, they dont. In fact, the modern rules of land warfare prohibit terrorism and unnecessary attacks on civilian populations. I dont agree with your premise at all, especially the point about terrorism being a fundamental part of every war. Its simply not.
I know it's a dangerous issue to insist upon, saying that terror is a necessary part of war can be taken as advocating more brutal kinds of warfare. But it's a risk I'm willing to accept for the sake of pointing out that wars are always very, very nasty business. No amount of rules of warfare will ever end the use of terror in war, I'm afraid. Best to avoid war altogether as much as possible.
The issue is that to win a war you always need to make the enemy accept your terms. And the enemy isn't simply the military you're fighting: it's the civilians. The civilians are the goal you set to capture, their military only the obstacle preventing it. You defeat the military, then way? You proceed to occupy the land! You proceed to submit the enemy civilians to your rule. If you abstain from doing it you cannot win. In fact if you were going to abstain from threatening the enemy civilians into submission - by force - then the enemy would not have needed a single soldier in the first place! They could just sit there and mock you. There would have been no fighting, no war, and no (new) peace (the standard motive for fighting a war).
The "problem" with many prolonged modern wars has been precisely that beating the civilians into submission, in our era when - fortunately - we do have some rules of war limiting the violence against them, is extremely hard.
There may(?) be one kind of war that does not fall into this pattern, the one where the goal is indeed only to destroy the enemy's military, perhaps as some kind of preventive measure. But has ever a war really had such limited goal, been won, and that goal been strictly respected? Has ever a government held back from following up on such a victory with additional demands?