If I have it right, the THW has increased the level of service.
If you join the THW, you are a part of the federal government, and society recognizes you as part of the government. I don't mean as a member of Parliament or whatever, but you have a special status for the government. This shows others that the only chance to manage these disasters and support people in need is when the government—either the local or federal government—and citizens work together.
This is the big difference with a lot of other countries. Our civil defence system and protection system are volunteer-based systems. It means the government works together with the citizens. The citizens aren't blaming the government if something goes wrong, because it's an “all-burden” problem. We work together on disasters. This increases resilience for the country.
I hope I got it right, but I'm not sure.