The suffragettes were not regarded as heroic by the police at the time, they were imprisoned and tortured - with the approval of a lot of society, at the time.
I think the key issue is one of proportionality : is the cause significant enough, are the harms caused against the protesting group provable from historical evidence and significant, and have non-violent efforts been attempted before turning to violence - that's just my own off-the-top-of-my-head test of proportionality of political violence.
My own elders took part, reluctantly but bravely, in a violent rebellion against the centuries-long occupation of my country - centuries of oppression, murder, starvation, ethnic cleansing, religious discrimination, grinding poverty, cultural eradication - the list goes on and on. Millions of people had suffered and died. Peaceful and parliamentary resistance had been ignored. The status quo was unsupportable.
The suffragette cause was that one-half of humanity was excluded from full citizenship and the protection of the law, and centuries of peaceful and parliamentary methods had been ignored. The status quo was unsupportable.
Turning now to the transgender movement - where is the denial of civil rights? where are the decades, centuries of brutal oppression? where is the evidence of decades, centuries of peaceful protest which has been ignored? What is unsupportable about the status quo where transpeople have exactly the same rights as everybody else?
How can the likes of BashBack claim that their violence has the justification of proportionality?