A good place to see that politicians are generally clueless and incapable or unwilling to see facts.
In most cases politicians have no obsession with DNS. They simply recognise that DNS services of ISPs is one of the few things they can control for any company that's registered within their country. It's not like they have authority outside their borders. The fact that *you* can bypass it is irrelevant. Most people don't. It's a solution to the uncommitted, and an attempt to block incidental piracy, not to put in place a technical solution that would stop the highly technical folk of Slashdot or those committed to finding a source of pirated material.
The actual alternative is build a great firewall, and politicians are clever enough to know that won't fly.
Your obsession (actually not just yours, it's a wide spread trend here on Slashdot) with absolutism is what is really stupid.