In fairness, Trump's tweets are not about actually doing anything, they are more about getting votes. So arguing the feasibility of suggestions outlined in a Trump tweet kind of misses the point.
replies(6):
Trump is very much saying he believes looter should be shot.
Though laws vary widely in the US, in CA the punishment is about a year in county jail, give or take:
https://www.nytimes.com/2020/05/27/arts/design/van-gogh-stol...
and
https://www.nytimes.com/2020/05/29/us/politics/klobuchar-min...
"During her own presidential campaign, Ms. Klobuchar faced continued protests, as well as some calls to drop out of the race from local black leaders in Minneapolis, after news reports found numerous faults in the prosecution of a black teenager named Myon Burrell while Ms. Klobuchar was the prosecutor."