"Oh."

This keeps getting worse and worse, and Luca is so glad he's seen Rapunzel and knows everything worked out between them and they made up, because right now his friend's past is starting to sound really bad. He understands why Varian did it, he was desperate to save his dad. Still, learning Varian kidnapped and threatened Rapunzel's mom, tried to kill them when Rapunzel wasn't able to save her dad, and then helped take over the kingdom. At least it's clear he really feels bad about all of it? And he stopped the people who wanted to kill everyone in the end! And has been working hard to make up for it!

"Wow. That was...a lot. But you changed! And...you did it because you wanted to help your Dad, even though that doesn't really make it okay, but...you're better now. And...did I ever tell you Massimo used to be a sea monster hunter before he met us?"

And now Massimo was the one who saved him and Alberto, and even adopted the latter.

"And now he looks out for us. So I know sometimes people can go from being really bad to really good."

Not that Massimo knew they were people when he hunted them, so it's not entirely fair to say he was really bad at the time.