It is obvious that the PA can not do anything until after the elections. If they appear to alienate their client base by arresting "murder-heroes" then they will not win the election and Hamas will be the political/military group you will have to deal with. If you are patient and wait until after the elections the PA, who would already be in power, could start the systematic dismantling of terror organizations and do it with the support of the people. This isn't rocket science guys. Just stick to your agreements and ride out the election and then your demands on the PA will be viewed as valid and would be supported by the US.
First refugees travelling on Hungarian bus arrive at Austrian border (Reuters)
from the article: Israel suspends convoy deal; U.S.: Buses must run