Right, because Greek governments, including Syriza, have a good track record in keeping promises and getting things done. Syriza has done nothing in the past months. They have gotten nothing done. There is no reason to trust their competence.
For instance, it is completely baffling to me that Syriza hasn't done anything to replace parts of the pension system with a social security system that grants each Greek the minimum amount of money necessary to survive. Currently, pensions are used to sustain entire families since there is no other social security net to do the job. Any truly social-democratic/left-wing government would have made this its top priority. And no Eurozone government would have the support of its people to cut a minimum social security system. Yet, Syriza has done nothing but propose to keep the old, ineffective, and unfair pension system. There is just no detectable willingness to meaningfully reform the state.