Who cares about the 45% Ghash.io have - will you care when they are at 51%?

Nearly nobody is discussing about that time Ghash.io hit that high level against.

Why? Isn't it a problem? ( remember 7th Janurary what happend to the price and what Ghash.io tolds us on 9th ....)


Update:
"Who cares about double spend. The more important risk is jamming up the system indefinitely by not allowing transactions through, or implementing white lists by only allowing certain transactions through from preapproved addresses.?"