1. We all have cars
That's because, while Silicon Valley is slightly more populous than SF (the San Jose Metro Area alone accounts for 1 million people, compared to 830K for SF), it's also a zillion times bigger, spanning almost two entire counties (Santa Clara and San Mateo).
2. But we don't take them to Giants games
Mostly because drinking on the Caltrain is totally sanctioned by the Official Board of Totally Awesome Public Transit Rule Makers.
3. 280 > 101
No matter where you are going, it’s worth the extra time to get there. Plus, it means getting to see the Flintstone house.