Know why breaking windows is stupid? Because windows are useful. If you break them, they cease to be useful.
Buildings are useful. They give shelter. Why would you destroy what you can use?
Smashing a bank's windows doesn't smash the bank. It just makes a window not work any more. Smashing a window is confusing a symbol with the actual. To paraphrase Adrienne Rich, some people confuse the wreck with the story of the wreck---they confuse the bank with a building. It's like demanding Guantanamo be closed without realizing that closing Guantanamo doesn't end rendition, unlawful imprisonment, and torture, nor does it bring to justice those who perpetrate such cruelty. Closing Guantanamo just means the people who do these things rent a Uhaul and move elsewhere, while everyone buys the world a Coke sure in the knowledge that the end of what is happening at Guantanmo means hanging a closed sign on the door.
Moving in gets you a roof over your head. Keeping the windows unbusted gets you light and a view of the world. Choosing to not bust a symbol means fewer symbolic excuses to break real heads.
And it means not wasting something useful for some hypothetical symbolic gain.