While I certainly don't want to encounter the kind of police corruption that the third world has to offer, neither do I want to be exposed to the kind of police corruption the first world has to offer. ANY police corruption is bad and defending it is contemptible. Protesters are not employed by the people and trained to keep order. The police are, and should be held to a higher standard.

In answer to why defending the bubble girl arrest is defending corruption, it's because arresting people for no real reason is corruption. It's the same sort of corruption that puts cyclists in front of judges for fantasy crimes such as 'cycling in the roadway'.