I've seen what I believe to be similar effects repeatedly over the years. I tend to believe that HT has given the reason that explains almost all instances...quick-turret, invisible tanks at spawn, etc... Combine that with the fact that a really good shot, or a good ambush, can "feel" like an unfair kill...and I think there's a lot more frustration over unfairness than may truly exist. I've been questioned along these lines before, but really only as a result of the other player confusing 'exploitation' with good tactics. (That's not intended as a shot, Sloe, just a point). There are also, admittedly, a few terrain bugs which result in some exploitable scenarios (underground spawn, invisible craters, etc...) that folks will use if they find themselves in that poisition. Who wouldn't?
Hell...I even thought I was seeing lag invisibility once, only to find out that I hadn't switched to ground view (this will nearly guarantee invisible tanks!)
While there may be a player or two who are really guilty of something unfair, I still believe that HT runs a pretty tight ship, and take this stuff seriously. Take those films, and they'll help you out.
Last, a suggestion: Never conduct an "aggressive tactical suppression" (like the self-serving euphemism?) from directly behind, or inside, the indestructible hangar. Too close, visible to anyone in tower, and easily overwhelmed. Set up with some range, good cover and an escape route planned. Good Luck!
I Have Spoken.