I hate their guts too be honest. And I wished they still had that entire string of negative racials they used too have. We'll see about that superiority of yours once I turn the elements against you and your weaknesses!

We have the strongest wizards in all of Tamriel. Plus we have the Khajiit. As disgusting as they are, they're useful cannon fodder.

You're only making me wonder how Martin was able to use the Amulet. None of the other Septims were Dragonborn and Uriel VII/Martin were not even really related to Tiber.

This is addressed in in-game books. Dragonblood is a blessing of the gods, not passed genetically.

An undead Thalmor killing other Thalmor is even better

I know it's not passed genetically, which is why I started to wonder how Martin used the Amulet. But if Martin was blessed by the Divines, then it makes sense. (That last part was what I was getting confused about. I thought the only two recent Dovahkiin were Tiber Septim and the PC.)

Very few realize that being Dragonborn is not a simple matter of heredity - being the blessing of Akatosh Himself, it is beyond our understanding exactly how and why it is bestowed. Those who become Emperor and light the Dragonfires are surely Dragonborn - the proof is in the wearing of the Amulet and the lighting of the Fires. But were they Dragonborn and thus able to do these things - or was the doing the sign of the blessing of Akatosh descending upon them? All that we can say is that it is both, and neither - a divine mystery.
The line of Septims have all been Dragonborn, of course, which is one reason the simplistic notion of it being hereditary has become so commonplace. But we know for certain that the early Cyrodilic rulers were not all related...