Really, once Clara made up her mind, arguing was pretty much pointless. She could be quite stubborn in her beliefs until proven otherwise. And even then, if she truly believed in someone? Well, she would make it a point to stand by their side. She may have only travelled with the Doctor twice so far, but to her, she felt like she had a decent read on him.
"And sometimes you're stuck with two bad choices and you still have to choose." Besides, it was impossible to know how things would turn out if the Doctor chose a different way. If one of his successes were to be a failure. What would that chain reaction be? "And really, it's not right to make decisions for others. You may think he shouldn't invite them, but at the end of the day? It's still their decision to make."
Which of course, was always a sticking point for Clara. Why she was so upset with her dad, even knowing that he had her best interests at heart. He still made a decision about her and didn't let her make it. So of course when it came to being able to choose, Clara would always side with that. Not to mention, she had made the Doctor come back to show she had control on the situation. She would always have control on the situation. Or so she would keep telling herself.
Clara didn't know about these sacrificial choices. She had made her own in the one dream. Though really, a leaf to save an entire ring system and the Doctor? It was just sentimental value. She had gone back because you never left something precious behind. You fought. But whatever scars this Time War had left on Troy (no matter how he decided to look at the dreams), they were clearly going to take time for him to come to some sort of terms with.
Though it seemed that the conversation was coming to an end. And perhaps it was for the best. They both had their opinions on the matter, and while they could try to make the other understand, she doubted much good would come from it. So Clara stood and kissed Troy's cheek.
"Fine. But you know if you need to talk, all you need to do is ask." Mugs gathered to put in the kitchen, she headed to the bedroom. Even if he didn't ask, if Clara felt he needed to talk later, she'd push him on it.