Why would it be? This is not the biggest ransom or death that involves Bitcoin or Monero? It may be the highest profile case in the US, but worldwide it is insignificant and nothing new.
At first I was shocked that this became so popular news because there is nothing spectacular there and such kidnapps happen often without gaining any attention but I guess, this case became high profile because Savannah Guthrie is a co-anchor of NBC's "TODAY" show and since she is famous, it reached to the White House and then President Donald Trump expressed his support for the family and offered federal assitance and in the end, it became a high profile case.
Some people are mistaken and believe that it only involves the ability to use some tools like mixers, but that is not true. This involves deep knowledge against de-anonymization attacks and countermeasures. A whole deal of tools would have to be used in order to cover this up and get away with it, especially when so much attention is given to the case by the US. The number of people who could execute this and not get caught is rather limited.
Since the kidnapper asks for Bitcoin instead of Monero, I'm sure that he doesn't know how to protect his privacy well, so even if he gets paid $6 million Bitcoin, I predict that he will be exposed the moment he tries to withdraw his money.