If protestors organized in front of a police station to protest police violence and then attacked a police officer who tried to make her way through the crowd to the office, would you still be defending the protestors?
It’s not an excuse to just be in the way and then attack people who try to get through.
If they in any way used disproportionate force? Yes.
This is what needs to be understood: a car moving through a group of cyclists can easily cause death or injury, and regularly does. The cyclists aren’t going after people who disagree with them. They are going after people who willfully try to use a multi ton vehicle against the human body to get their way.
It’s not an excuse to just be in the way and then attack people who try to get through.