

I barely know anything about the Polish anti-communist efforts, but I know for a fact that it absolutely did involve violence from both sides. Again, just because one sect is dedicated to non-violence, the larger movement requires the threat of violence to succeed long term.
Also, you kinda prove the point of this post, the Solidarity movement were dedicated anti-violence, but they were brutally repressed by the regime regardless.
Absolutely right, violence by itself solves nothing and only creates more problems, but a completely non-violent movement is also doomed to failure because they will be violently repressed and victimized by the establishment if they show any sign of succeeding.
A successful movement must contain elements willing to escalate and threaten violence, and also elements who disavow that same violence and seek a peaceful resolution. We’ve seen this time and time again throughout history, but a few recent examples which would be familiar to most are the LGBTQ+ liberation movements which turned the tides with the Stonewall riots, and the civil rights movement, which had a whole spectrum of activists - MLK, the Black Panthers, and Malcolm X.