2. Republicans demanded budget cuts in return for raising the debt ceiling. This is their bag.
If they had simply raised the debt ceiling, like they have does dozens of times previously, the sequestration scenario would never have existed. Republicans could have also avoided sequestration by agreeing to a 50/50 mix of tax increases to spending cuts, a 'compromise'. They refused even a 20/80 mix of tax increases.
Blaming Obama is like blaming the hostage for going along with their kidnapper.