https://en.wikipedia.org/wiki/International_sanctions_during_the_Ukrainian_crisis Note there is a section specifically dealing with Crimea.
Here, early on is the White House denouncing the Russian imposed vote in Crimea using far tougher language than the resolution used. Not to mention, Samantha Powers explained that they ABSTAINED because they disagreed to some extent with the language.
What you ignore is that actions by Israel put Obama and Kerry in the position where not vetoing the resolution had to be done - unless they wanted to be seen as liars. The Knesset action to greatly expand settlements and to actually legalize ones ISRAEL had considered illegal was a step too far. Note that Powers spoke of the fact that settlements increased after the US vetoed the 2011 resolution.
You might also remember the perfidy of Netanyahu in introducing the Hamas ceasefire proposal as "Kerry's and Obama's" when he knew it was not. Hamas via Oman passed the proposal to a conference in Paris and Kerry then passed it to Netanyahu. This was done because Israel (and the US) and Hamas do not talk. From the Israeli media it seemed that Netanyahu thought it was too soon to have a ceasefire as Gaza needed to feel enough pain to be deterred from future attacks. The odious phrase "mowing the grass" was used by one of Netanyahu's cabinet. Point here is that Netanyahu was willing to DISHONESTLY throw both Obama and Kerry under the bus. Fortunately, the rest of the world (outside Israel and parts of the US media) give Obama and Kerry far more credit as honest statesmen than they do Netanyahu.
You might also remember that a few days before the Israeli election, Netanyahu said there would be no 2 state solution - contradicting what he had told the world. After he was elected, he again said he was for a two state solution. His actions show that he may well have been telling the truth before the election. Obama tried via two genuinely talented diplomats, George Mitchell and John Kerry, to find peace -- in fact, Netanyahu could have spared both of them the time and effort by being honest and saying he was unprepared to do so.