Answer:
Yes, it is worth the upheaval and damage.
Yes it can bring real and lasting change.
Step-by-step explanation:
In the history of humanity and advanced societies there have been a lot of bad rulers and leaders, revolutions have come to exists due to those bad rulers and leaders, if you analize the different revolution that people have lived through almost all of them brought difficult times during the battle and early years, but after that the situation stabilized and life got better for the society involved, the French Revolution, for example is a great example of bloodly, violent but effective revolution, it inspired the independance in the american colonies, and it helped chage the world, but this was only possible because the people that were put in charge after were good leaders, for example in the soviet revolution, there was a time of prosperity and technological advance, but came at a great cost, people lost their liberty, and that was because the leaders put in charge were all about the end and that justified the means, while a leader should know that end is as important as the means.