The ACLU is not a partisan group. They've criticized Obama where they felt it appropriate:
This is from long experience, at least on the left end of the pond, where the mainstream Democratic partisans attempt to shout down any protest when Democratic politicians do something but encourage it when Republicans do equivalent things.
Who cares. "The best time to plant a tree was 20 years ago, the second best time is now".
You should care, as should anyone who is aligned with these protestors' views. That's because if (or when, if history is a guide) the protests subside because "we elected not-Trump/Democrat-X/whatever", the gains will be eroded or erased as Trump's policies are continued by the new "savior."