No, the fact that people occasionally get hurt by accident with fireworks does not make the violent subtext in "attacking a government building with explosives" a correct description of the situation.
In fact, let's use your argument. People drown accidentally in swimming pools regularly. So then if some "protester" decided to set up one of those portable pools and forcibly hold people down under water in one, wouldn't they be guilty of attempted murder?
Using things that are known to cause death and serious harm in a way that is intended to cause death and serious harm is in fact the thing I'm against.