The thing is, capitalism has never been reformed ‘peacefully’.
Reform movements which have formally disavowed violent means - from the Civil Rights movement in 1960s America, to Attlee’s Labour government in 1940s Britain - have only been historically successful because mass, organised, revolutionary movements of the politically disenfranchised outside of the formal reform movement have forced those benefiting from the status quo to cede concessions to non-violent, often middle-class, reformist leaders. Malcolm X, the Socialist Party of the USA and the Communist Party forced the American elite to come to the table with Dr. King; the syndicalist and communist trade unions in post-War Britain made opposition to Attlee’s NHS and limited nationalisations foolhardy.
Those who preach non-violence as a strategy rather than as a flexible tactic fatally mistake capitalism for a rational, logical system which plays by its own rules and respects human life.
We know better.