The argument for radicalism is preferable to achieve social justice is that:
Incremental change is one that makes effort to solve issues through the use of small, systematic steps that brings about or influence change over time.
Note that through the incremental method, governments can lower the risk and base their focus in working to make the system better instead of starting from the bottom and forming a new one.
The disadvantage of in radicalism is that it often begins from grassroots activism and most time it is always too spontaneous.
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