Because I can? I don't know? It's the only thing in this thread that is real, and something you can do without putting yourself at risk. After you watch the sun go down, you can see the 3 planets lined up. Seems on topic to me.
Also, Mercury is very elusive. It's fairly rare to get to view it so well. And, looking at Venus, Mars, and Mercury is basically looking at the sunlight reflected off of them, so technically still on topic.
How's that?