How would president lyndon johnson be able to justify the use of federal troops to manage riots during the summer of 1967

Because the riots during summer of 1967 lead to several acts of criminal offense such as destroying properties and looting.
An act to protest for civil rights will always be welcome in united states, as long as people do not use the movement to mask their true negative intention to steal and hurting other people.

btw lyndon was no good dude