Why did journalists call the Alaska purchase of 1867 “Seward’s Folly”?

Public opinion supported the purchase of Hawaii.
It was contrary to the idea of Manifest Destiny.
They wondered why the United States would want a vast tundra of snow and ice far from the continental borders.
They believed that the United States instead should direct its energies toward Latin America.

Question

Why did journalists call the Alaska purchase of 1867 “Seward’s Folly”?  

Public opinion supported the purchase of Hawaii.
It was contrary to the idea of Manifest Destiny.
They wondered why the United States would want a vast tundra of snow and ice far from the continental borders.
They believed that the United States instead should direct its energies toward Latin America.

anonymous · Answer

I'll go with the third pick - They wondered why the United States would want a vast tundra of snow and ice far from the continental borders. 

It was seen as a friendly gesture towards Russia, who wanted to sell it, as well as a way to snub Great Britain's own ambitions in the region though those calling it Seward's Folly thought it was a foolhardy purchase for the reasons above.