If that is the case they are guilty of trespassing. Hasn't to do with cameras, nor should it. Trespassing and photography are separate activities. One of them is illegal, and the remedy for an aggrieved party is clearly to pursue prosecution of the illegal activity, not pass laws against innocuous activity. The premise that one illegal activity must penalize another perfectly legal pursuit is a logical fallacy, and a slippery slope that will lead to all sorts of implied causality regulations. Rock music causes sex and drugs you know.