This is as much a question of being a completist than caring about the characters. I used to see more people like that. But, after the mid-90s, that dropped off.My comic shop has reported that there are people that will go in and buy absolutely anything with Wolverine on it just because it has Wolverine on it, even if he's not in the story.
It is a question of expectations. Again, Skywarp is not the brightest bulb. He knows something is wrong, (as evidenced by his talk with Thundercracker after their little tiff with the Insecticons), but cannot quite understand it. But, he understands that Megatron is the boss and Thundercracker is his buddy. Thundercracker is his buddy who has been there since day 1. His buddy who is a bit smarter, but still his buddy. And, his buddy is a good Decepticon.If Skywarp really sees Thundercracker as a 'big brother' type role, then why wouldn't he wait for Thundercracker to at least try to explain himself first? Seems to me that's a justification for making it a "why would you betray us brother?!" type moment. Instead he just accuses him of betrayal and blasts him. Not a very "civil" nor "brotherly" reaction, even assuming he was "pushed to the edge".
Skywarp knows Ramjet. He might warn Ramjet not to screw around. But, he does not expect much from Ramjet. (Skywarp even agrees to meet Ramjet the next day. He expects Ramjet to do the stupid thing he warned Ramjet not to do.) He expects more from Thundercracker. Just like a parent is more likely to yell at the "smart one" for being stupid, we tend to be harder on our peers when we expect better from them. When somebody deviates from expectations, we tend to be annoyed. When we have high expectations, we are even less forgiving.
Dom
-and Thundercracker did not meet expectations.