Some Trump supporters are using Trump's volatile nature as an excuse to say and do whatever they want. Burning and spray painting a black church is not exactly the best way to get the word out about your favorite candinate. It is disrespectful, rude, violent and criminal. They should not get away with this.
There will always be extremists on either side of an argument but when property starts getting damaged and people start getting hurt then people are crossing the line. We need to respect others peoples ideas and beliefs and not take extreme action just because we don't agree. Differences in people is what makes America great and we can't forget that.
Yes, Trump supporters are out of control because they incite violence and are generally racist. They like Trump because he wants to make America great again. What does that mean? It means that he wants to take away power from the first black president and not let a woman serve.
It probably wasn't a Trump supporter that burned and spray painted the church. It was probably a Clinton supporter that wants to make the Trump supporters look bad. Clinton apparently staged people to disrupt Trump rallies, so it wouldn't be surprising if they staged people as Trump supporters in order to burn down and spray paint a church. Trump supporters are not out of control.