There is no logic to what people are afraid of. And most on these forums are so wrought with fear, they have no idea what they are criticizing Obama for - just that they are lashing out because they are afraid of him.
The latest and greatest (on these forums) is that Obama should be held responsible for what occurs on the battlefield - i.e. ISIS go it's hands on a US weapons drop and Obama is responsible for that. Yet, Obama gets no credit for the assassination of Osama Bin Ladin. There is a fundamental contradiction to this - and, it just serves one purpose; bash that which I am afraid of - the president.
By all means, criticize the president (I have), but when double standards, hypocritical views and just good old fashioned hur dur dur rule most of the criticize towards the president, it just means they really don't have much of anything against him,.. except fear.
This fear comes from a conservatives defective and alarmist mind. So, it's not really the president, it the group of people who constantly view most things as a danger and proceed to raise warnings, alarms, sensationalism, etc.