How can anyone take Trump seriously?

I've said it before - Trump talking off the cuff doesn't even reach the eloquence of a smart primary school student:

TRUMP: It crossed a lot of lines for me when you kill innocent children, innocent babies, babies, little babies, with a chemical gas that is so lethal, people were shocked to hear what gas it was. That crosses many, many lines, beyond a red line, many, many lines. Thank you very much.

but more seriously, his ridiculous insistence that everything is always someone else's fault is at the forefront again, in hyper-hypocritical fashion:

Here's what Trump said:

Today’s chemical attack in Syria against innocent people, including women and children, is reprehensible and cannot be ignored by the civilized world. These heinous actions by the Bashar al-Assad regime are a consequence of the past administration’s weakness and irresolution. President Obama said in 2012 that he would establish a “red line” against the use of chemical weapons and then did nothing. The United States stands with our allies across the globe to condemn this intolerable attack.

First off, the statement reads like something that you would put out in the heat of the campaign. Half of it is devoted to what the past administration did and didn't do. Certainly the Obama administration took heat — and most would say deservedly so — for not holding to its “red line” policy on Syrian President Bashar al-Assad using chemical weapons. But two full sentences — out of four?

Second is the fact that Trump himself in 2013 urged Obama not to enforce that red line. To wit:

But even more conspicuous than that, the statement takes a harsh tone toward the Obama administration without saying what the Trump administration will do differently. The applicable Trump policy here, in fact, appears even less stringent than Obama's was: It's leaving Assad in power in the name of fighting the Islamic State (ISIS) first.

As recently as last week, both Secretary of State Rex Tillerson and U.S. Ambassador to the United Nations Nikki Haley both signaled that Assad would be left alone.

“Are we going to sit there and focus on getting him out? No,” Haley said.