The wrong lesson learned was, “don’t use IPv6.” Which has, to a large extent, hurt the uptake of IPv6 everywhere, because “if the government doesn’t use it, we’re not going to use it.” Rather than do something sensible, like enable the IPv6 functionality of the firewalls and configure them properly.

Imagine this:

You shot yourself in the foot (literally) due to sheer incompetence. How do you fix it?

Do you: (a) take shooting classes or (b) have your foot amputated so you can’t shoot it again

I think the right choice is clear.