Christmas ticky tacky

Not to be a Scrooge, but I have a question: Why do so many people go overboard with the holiday decorations? 

What would possess anyone to even buy this stuff in the first place?

I can understand a few lights. Maybe some discreet, tasteful fake candles in the windows. Or a classic evergreen wreath on the front door.

But this?

This is one of many such "displays" I've seen this year in Indianapolis. Actually, this one is mild in comparison to others I've seen. 

I don't get it! It doesn't make me "happy" or "joyful" at all. In fact, it makes me rather sad and depressed! Sheesh!