Not every opportunity is great for everyone; people with families generally don't like to travel, that doesn't mean that a job that entails travel is a bad one.

Having a family is clearly a choice. And having 3 kids is very different from having 1. These people will always have less material goods and have a harder time scraping by than someone with no dependants when the cost of living is high. This is true of any industry in any expensive area, it's what you should be expecting if you have kids.

In any case, the original comment is wrong about housing prices, you get shafted when you try to live right in the heart of SF, pretty much everyone with a family is going to have to commute from somewhere, you can still get comparatively cheap 3 bedroom houses in san jose, and there's still plenty of tech companies with offices in the south bay.