Civil disobedience is a critical part of a functioning democracy. Defying unjust laws raises awareness of how unjust they are, and if the public is persuaded that the law is wrong then sometimes the laws will end up getting overturned. In the worst case the conscientious objector ends up getting crushed by the system. So when activists break laws they don't do so willy-nilly, because the stakes are so high.

Your claim that laws must always be obeyed in a democracy is gross. Are enslaved people supposed to follow the laws in a democracy that say they cannot fight for their freedom? Are we to condemn black people who organized sit-ins to protest apartheid? Are you not aware that practically all rights we enjoy today are the result of activists who risked their life to fight for these rights? Think for a second about the implications of blind obedience to the law, and the ugly historical record thereof!