You know, Abbas' PA also helped Israel pre-war by providing them with intelligence and locations. They also lobbied for Israel not to stop until Hamas was destroyed and were discouraged that Israel failed to do so. So if you were going to accuse Abbas of treason...well, it's a little late for that.
Jordan foreign minister says to speak with Kerry on Israel-Palestinian conflict (Reuters)
from the article: Hamas accuses Abbas of treason for 'justifying' Gaza war