That is, physically incapable of it UNLESS air traffic controllers on the same team had vectored the target craft into some sort of a killing bottle and THEN put the 25 straight down on top of it.....
Okay, "straight down on top of it." The closest the SU25 can get with a full combat load is 17,000 feet from the airliner while being directly below it. It's combat ceiling is 16,000 feet with the combat load. The airliner was at 33,000 feet. The only way it can go higher is if it's stripped of everything. In which case the closest it can get is still 10,000 feet away, unless they pick up speed and use momentum to fly a little higher for a short period of time, but then, unless they're directly below it, aiming straight freaking up, they're still too far. Oh, and they don't have a combat load. Next, the airliner is moving twice as fast as the SU25.
That's a whole lot of freakin trouble to shoot down an airliner.
Meanwhile the Russkies were releasing tweets and photographs thumping their chest at their latest victim on their social media. Russian state controlled media was first on the scene too. Afterwards they about-faced. Started denying everything. And even released conspiracy theories that the plane was filled with people who were already dead. Oh, and IP addresses from Russia engaged in a Wikipedia editing war trying to increase the speed and altitude of the SU25.
Whaddya think is the most likely answer of "who did it"?