> Aren't you worried that by applying political labels like 'left' (or equally often seen in the US context: 'liberal') for something that does not really represent that political ideology

I don't have the experience of any other group doing this. I agree that it is not inherently a political ideology.

The people involved proudly proclaim to be left and liberal. I think it is important to say that because I know people in other parts of the country that see these as insults and would be surprised to know that people commonly self-identify as these terms.

I find that this group thinks their behavior is better and more helpful than apathy, "silence", and the idea of rampant exclusionary hate from the right. When its really not better, its different, but its not more helpful. There is absolutely a constant threat from people afraid of bird watchers in a park, people that blend into their ranks and are willing to weaponize their understanding of race, two seconds after donating to the Democratic Party.