permits to march. They have no other interest than to agitate, sort of like someone burning the American Flag or sticking a crucifix in a bucket of urine. Limiting their exposure and attendance is what is best for all.
The KKK is on the furthest end of the spectrum, antifa is not as severe but they are certainly in the same neighborhood. They have threatened violence against any entity or person that speaks about or represents something to which they don't agree...Ann Coulter in Berkeley as an example. You are mistaken when you say the want equal rights. People pushing for equal rights don't threaten someone just because of their speech. They are using liberal causes to justify their terrorist and extremist ways.
Additionally, there will be broad disagreement about BLM's push for equal rights. What is their request? As you have even commented, there is no easy solution; absent fathers, no jobs, incredible murder rates, etc.) They aren't asking for equal rights, they are asking for special rights, special investments. What's ironic is that the more they demand unique solutions, the more they are saying we're not as good as others.