But they condone it by not condemning it. Any organization that expects to be treated as legitimate can't stand by while people identified as members of their group (correctly or not) cause such destruction and terror. But there gas been no such statement that I've seen, just that property is less important than lives, which everyone should agree with but let's not minimize people's life work and means of living as nothing.
Just because you haven't see BLM protesters condemning the violence and destruction, doesn't mean they haven't been. I've seen quite of a lot of such statements, which have been broadcast on mainstream media. Often from the family members of the very people who've die (whether justifiably, excusably or otherwise) at the hands of law enforcement. But also from local leaders, during protests. You might consider broadening your media intake if this is news to you. If only to get an alternative perspective. People can "report" whatever lies they can get away with, but when there's video and audio of it happening in the moment, that's not something easily dismissed as fake news.