Answer:
yes, because the 1st amendment basically is saying that it gives everyone the right to freely express their self in the way they practice religion, how they exercise they're speech, and how they protest. While burning the US flag is a horrible act it is the right of the citizens to do so if they so chose.
Society is a long standing group of people sharing cultural aspect such we language, dress while civilization is an organized culture encompassing many communities
Short answer they wanted to do solo music, Zane was the first one to leave due to stress and anxiety while on tour in 2015 , but they did recently go on tour again :)
