I'd never mess with someone's outdoor grow, with one exception: if I found an outdoor grow on MY property, that would put me at risk, and I'd probably take it if it was close to harvest, or just kill 'em off. That happened to my brother once, he found some plants growing on his land, close enough to harvest. He got a pound or a pound and a half out of it and felt no guilt. Guerilla grows are cool, but if you're gonna do it, use public land, not someone else's private property.