"Send the Army and get control" sounds great to a non-military person, but it's a sure path to disaster.
The Left needs to own their failed cities. Sending in the active-duty military shifts the blame for all subsequent civil breakdown to Trump.
(This does not include state National Guard units called up by governors.)

Because sentence against an evil work is not executed speedily, therefore the heart of the sons of men is fully set in them to do evil.There is no such thing as the left owning anything; letting them pull down the system is giving them exactly what they want.
Ecclesiastes 8:10
Neither are the same situations. Lebanon was a foreign intervention where we just showed up without any plan or purpose. Northern Ireland is a situation where the Brits are fighting against people who think N. Ireland is not British. If U.S. troops show up, they will be welcomed by the People who want the rioting stopped. We don’t allow U.S. citizens to be terrified.
You are not going to get much support from Freepers for your advice to Trump to resist sending in troops to quell the rioting and looting.
But you are right. Stick to your position. The MSM is salivating over the hope for innocent civilian deaths at the hands of the military. And dont let anyone tell you that there wouldnt be civilian resistance to a military occupation. And political resistance. And MSM resistance.
I think the DEM mayors and governors will either let their police forces do their job and put down the resurrection or will give up and ask Trump to send in the National Guard. Could be either. But it will be one or the other.