Protester's should not be treated as terrorists it seems a little extreme to react that way. Peaceful protests should be allowed to do their thing as long as it stays peaceful. The non peaceful ones need to be shut down quickly but it should not be done violently because than the violence will escalade.
First of all, many Constitutions around the world guarantee right to protest, so to call them terrorists is hypocritical. Also, if people are protesting peacefully, how is that an act of terrorism if no violence is committed? Protesters are an important part of peaceful social change in the world, and anybody who would interfere with them when they are not hurting anybody are terrorists themselves.