I somehow still think Thistledown did the right thing. Those who are like Rust Wing or Thistledown's father really need to do what's called "pick on someone their own size" instead of "prey on the weak."
I appreciate Fizzy's point about pursuing happiness. How people react to what makes you happy in life is on them, nobody should feel guilty about that. Obviously are exceptions like with everything, but most people's happiness can come from simple things which others just don't like for whatever stupid reason.
Also Tempest's line in that last panel makes it sound like she's starting to take their relationship more seriously.
Tempest: I'd like to see the pony that tries to go after MY benefits.
*A NEW CHALLENGER APPEARS!*
Celestia: Would you like to join me in my bed chambers Thistle?
Thistle: *fans her face which has an intense blush on her face*
Tempest: Square up your highness! I took you down once, and I can do it again!
And here i am, screaming at the Screen: " go upstairs and look after your adoptuv child! For every Reaction, there is a Reason! And if she is sad, or refuses, you should At least ask why..."
After all, they dont know Lulaby well enough