I think Mr. Hassler expressed his opinion based on the information available regarding Mr. Trump's views, opinions and actions.  "If it walks like a duck and quacks like a duck........." indeed, it's not uncivil to express the opinion that it's a duck.  Mr. Trump has repeatedly "rung the bell", then done his best to "unring" it.  That's very hard to do.  

BTW: You seem to equate throwing rocks at the police with actions such as suicide bombing:  Really?  "Terrorism is classified as fourth-generation warfare and as a violent crime. In its broadest sense, is defined as the use of violence, or threatened use of violence, in order to achieve a political, religious, or ideological aim. In modern times, terrorism is considered a major threat to society and therefore illegal under anti-terrorism laws in most jurisdictions. It is also considered a war crime under the laws of war when used to target non-combatants, such as civilians, neutral military personnel, or enemy prisoners of war.[1]"