I believe it is either Vince Coglianese or Dan Bongino who uses the phrase "emotionally incontinent" to characterize the unhinged behavior we see in the Left, and I think there is something particularly apt about it, especially when it comes to this matter of the reflecting pool.
This shouldn't be an issue. But it is. And it is primarily due to the existence of "The Orange Man", President Trump. When they hear his voice, see an image of him, or even just read his name, it is a bit frightening to see their reactions.
Their faces change as if a demon inhabiting them has risen to the surface where it can no longer be concealed.
Their countenances twist in a rictus of hate and anger, their fists clench and unclench, and they seem to fully lose control of themselves. They cannot filter what comes out of their mouths, and they simply override any governor on their behavior.
We laughed when the memes came out about Trump telling Leftists not to drink bleach, and they were shown in the memes guzzling Clorox. 
Another meme that surfaced after he suggested pregnant women shouldn't take Tylenol, and the Internet was filled with variations of memes showing pregnant women tossing whole containers of Tylenol down their gullets.
Yet another showed what would happen if he told Leftists not to drink their own urine:
All these things made us laugh because it was so close to the truth, or even the truth.
Then we get the "Reflecting Pool Controversy" and were presented with the spectacle of Leftists "playfully" (as described by AI) dressing up in "algae costumes" and singing songs to cheer on the formation of algae, hoping for something, anything to go wrong with the project was completely typical. 
And we get that silly political theater and understand it as Leftist politics. Stupid politics, but...politics nonetheless.
What was not "playful" or just "politics" were the people who tried their best to destroy the effort via physical vandalism, and the Leftists, nationwide, who fully supported the vandalism as a matter of course.
It is the non-human expression of the "assassination culture" that exists on the Left in this country today, supported by Democrats in government, and the Media in general.
I find the level of vitriol towards something that people should not even have any disagreement about doing to be a whole new level of emotional incontinence that I don't recall seeing before.
President Trump said this at the State of The Union Address:
There were people who were shocked that he would say that in that venue.
But with each passing day, they demonstrate on nearly a daily basis that Trump spoke the absolute truth when he pointed at them and said "These people are crazy! They're crazy.".