I totally get the reasoning behind it. The Rams spent all that draft capital and money to go up and draft a guy #1 overall, so they wanna see him play. They also don't think he can POSSIBLY do worse than Keenum, so that just exacerbates the situation and makes them even more antsy. So they chant in unison in the hopes that Fisher will turn around and go, "Derr, okay. You guys win. <groan>". It won't work, and I seriously doubt Kroenke is swayed by it either. Fisher will stick to his plan and play Goff when he feels like he's 100% ready to go, and that's that. We can all argue and comment ad nauseum that we know for sure he's ready, but that doesn't matter either. Fisher's gon Fish.
On a side note -- totally crappy thing to do, and it was embarrassing. Maybe others don't think so, but that doesn't change my opinion. And if you're okay with it, then you'll be okay with chants for Mannion if Goff puts together 7 meh games and the Rams lose 60% of them.