The movement publicly expressed non-violence right from the start, so bull crap 'underground' criminal actions are opposed to the principles all of the Occupiers espoused as a basis for originally getting together. Criminal acts oppose Occupy. Those actions are coming from the authorities, who fear Occupy. The 1%ers have been infiltrating progressive movements since the 1800's. SOP.
Some non-infiltrator activists occasionally do something dumb. When people get angry and hate-ful about a hateful system they are fighting against, sometimes their minds wind up in pawn to that system. Then they do something that is bad, and the system uses the incident for bad propaganda. They wind up working for the system, and they aren't even getting paid. But I haven't seen any angry or hateful people at the Occupy actions I attended.
Euph and Fire know I'm not an 'official' Occupier, because I blundered into their group on the 99% spring issue a while ago. I ally with Occupy, Spring, and Labor Dems on an issue-by-issue basis, or action-by-action basis. All I can say is Occupy is 99% right. Occupy is still outreaching to the unpoliticized 99% ers, and exposing the 1%ers. There will always be some bad guys out there, but refusing their 'underground action' enticements blunts half of their effectiveness. The other half is blunted by not distrusting strangers without good reason. Refuse to cease outreaching due to knowledge that the cointel 'pros' are out there. The cops want Occupy afraid to outreach and ally, because of worries about infiltration. They want an atmosphere of distrust among 99%ers who have been there from the start, too.