The paper makes it clear that it can — and it's actually important to avoid doing things like random murder. But the kind of nonviolent acts we've seen so far aren't a problem.
They also had a null result on policy support; the main impact was activating people towards more moderate activist groups.
The problem is that the things he can do without congressional support can be easily overturned by the next President — and the Republicans have a majority in the House of Representatives.