If an alien came to Earth and told you you could board his space craft and return with him to his own planet, would you? Would you go just to see what it was like? Or would you politely decline and hope he doesn't retaliate with his powerful laser? I could go either way, it would probably depend on the vibe of the alien. A chill dude who seems like he'd provide snacks for the journey? Yeah, I'm probably getting in that space craft. A harsh fellow who barks orders and seems like he'd play bad music? Yeah, I'll take a pass.
On the other hand, if I somehow ended up in possession of a baby alien, like in E.T., I would definitely keep it and help it return to its home planet. I'm not a monster. And then I can reflect on our time together with these sci-fi memes.