No point in going round and round with personal opinions and general speculation. The debate is easily settled: just point to some actual harm done by this hack.

I don't think you really understand how blackmail works. If the information is public, then that's a failed blackmail attempt. Also, the U.S. administration is unlikely to provide public information on how top officials have been compromised.

It's not really much of a debate as it's widely acknowledged that letting enemy states get access to the email accounts of officials is a really bad idea.