I disagree, really a lot of people just *don't care* about being anonymous.
The problem is their actions don't only affect themselves. People with bad habits like address reuse harm, not just their own privacy, but the privacy of anyone else they interact with. It's exactly like pollution.
I don't see how it's a security vulnerability though.
http://arstechnica.com/security/2013/08/google-confirms-critical-android-crypto-flaw-used-in-5700-bitcoin-heist/Treating public keys as single-use protects you from a 0 day vulnerabilities in a way that reusing them does not.