Some juncos laid eggs in a pot on my porch [View all]

I was so excited. Then the eggs were gone. I suspect other birds got them, because I saw some in the area. This happened last year in a hanging pot on the patio. But they have now laid more eggs!
I want to protect them, but how? I know I probably shouldn't try to interfere but I feel so bad for the parents. Should I just butt out and let nature take it's course?