Coming back to the topic of computer security, the TCP Wrapper is an example of such a safety net. I wrote it when my systems were under attack by someone who appeared to walk through walls.

I'm not a daredevil. I don't fly without a safety net.

In a previous life I wrote the software that controlled my physics experiments. That software had to deal with all kinds of possible failures in equipment. That is probably where I learned to rely on multiple safety nets inside and around my systems.

In many ways, we look at Uber as the safety net for a city.

We don't want to turn the safety net into a hammock that lulls able-bodied people into complacency and dependence.

A safety net for the poor indeed requires some level of income redistribution.