You sound like a Russian troll.
Don't be so abrasive...
It is a matter of noticing the behavior of a target. This one was very high, at airliner height in fact. The TELAR has an altitude readout, it also has an elevation display. Then there is the already mentioned fact that the TELAR had been parked under the intersection of three airways. There are not many places on the globe like that.
Still does not prove intent to shoot down an airliner.
1. A grossly negligent commander would not care where he positions his SAM units, so they end up under a busy airway.
2. A highly competent commander trusts on his (perceived) ability to tell apart airliners and military jets, and positions his units there, knowing there are airways above. Just as a sort of camouflage.
Why are you slanting your view to favor the Russians? Why not look at it with a neutral eye?
You don't understand my thought process. Just to make 99.99999% sure that my judgement is right, I begin my thought process with the assumption that they tell the truth and that they have acted correctly. And then I eliminate what cannot be the truth. For example, that they gave two different, mutually exclusive explanations for the shootdown - first, an Ukrainian Buk, and then, an Ukrainian Su-25. Another damning piece of evidence were the Twitter postings that were hastily removed.
I'm unwavering in my opinion that shooting down an airliner does not have any benefits at all. So it could never have been their intention. That's the point where I really, really believe what the Russian side is saying.
I assume that those tweets were posted by hangers on, truck drivers, mechanics etc. I am sure they got in deep dodo for making those tweets.
You assume something. Now, let's shoot down your assumption... those tweets were celebrating a shootdown!
A truck driver or a mechanic cannot know so quickly
that a shootdown happened. The only people who feel confident enough to make an nearly immediate celebratory Twitter posting about a shootdown are those who are related to the SAM unit. For example, people on a (para-)military command post.