Because of our propaganda. We heard all kinds of things about Russian military mobilization, conspiracy theories about who shot down the airliner, how much Putin hates gays, how horrible living conditions were at the Sochi olympic village, how "rigged" the Crimean referendum was, etc.
But we have heard nothing about NATO breaking its post-wall promise, of the enormous rise of nazism on Russia's borders( actual nazism, not the soft nationalism you see in France ), the outrageous corruption and duplicity of the players responsible for the ouster of Yanukovych, the ethnic and political divisions between the Crimea and Ukraine proper, etc.
I continue to be astounded that HN is so virulently anti-russia, mainly because I thought this group would be the most immune to propaganda and most likely to question the official narrative.