I don't think people should have very confident views about the political effects of any particular protest tactic, and certainly not anything like property destruction or setting fires.
1/

Sometimes they incite backlashes and reaction.

Sometimes they successfully put the relevant powers that be on notice and motivates them to avoid provoking such reactions in the future.
2/

Either one, or the balance between them if they both happen, depends on the decisions and actions of other people; they're not just natural facts about the world. Everyone should be very, very modest in their confidence about predictions about how they come out.
3/

If your confident prediction about those political effects closely tracks your view of the moral status of those action-- "arson is attempted murder," "chain stores steal from their communities so it's righteous for people to steal back"-- that's a very bad sign.
4/

And if it closely tracks just your sheer emotional reaction to the acts of destruction, whether disgusted anger or excited frisson, that's worse still.

Own up to your evaluation of the means, without unwarranted confidence about how it will all turn out.

/fin