I agree that they did it due to the national media. I also believe KD when he said it was a rule from back then. They just didn't enforce it until then or maybe they have during select times. I'm going to guess they did it when Stan was about to buy the Rams after Khan's offer but dunno.
Can't decide based on content unless it contains commonly accepted offensive language or something that could reasonably be construed as content that would incite.
My wife worked for the International Sign Association for several years and edited two books (including a Text Book for a Temple University Professor) and a magazine all on sign regulations, legal cases regarding sign regulations and ordinances, design criteria, letter size, the whole bit.
Pretty sure the Rams know at least some of this. And I'm also pretty sure they weren't willing to take the chance that with all the upset fans in the Lou that someone or a group of fans would not try to sue them over the issue. Again, you can regulate size, areas allowed, all kinds of things, but content you cannot.
Actually, I think the Rams would be perfectly within their right to censor the signs based on content. The First Amendment applies to Government censorship, not private parties. Any fans at the Rams' practice were guests of the Rams, and the Rams can regulate speech on the premises in this case (which they did) as they see fit, as long as no other laws are broken.
And is anyone really surprised that the Rams didn't want their only appearance on the NFL channel's training camp tour to be focused on the move? Clearly there is no real need to control the display of signs in non-broadcast practices. Rams management can just ignore them when no tv cameras are pointed at them, but the signs on that day were for a national audience and no one should be surprised that the Rams did not want to aid in the promotion of relocation advocacy in their own backyard because it would make them look bad. People may not like it, but no one should be surprised by it.
I think that while the Oxnard practices were calculated events based on the turnout in San Diego last year, I think that the St. Louis brethren can take some comfort that things should start looking up for the people of St. Louis. Over the next few months, more pieces will come together regarding the St. Louis stadium project (financing, resolution of law suits, property acquisition, etc.) with no real newsworthy events re Inglewood coming up. When St. Louis gets to present its updated plan in October, they should be riding a wave of positivity that will make Oxnard a long-forgotten memory. I anticipate a lot of pro-St. Louis news to come out in the next two months, and hopefully this will be further bolstered by success on the field, which can only help rally support.
The one interesting scenario that I have not heard discussed much, but that interests me, is the case where the owners meet in December but no back room agreement is reached, and both Spanos and Kroenke really do have the votes to stop the other one for relocating. What if this happens, and the teams are told that by virtue of the vote that no team is granted permission to relocate to LA in 2016? In this hypothetical, what if the Rams return to St. Louis to play in the dome for the 2016 season but Kroenke, without making any public statements whatsoever, begins construction of the Inglewood project in December as planned? That places Spanos and Goldman Sachs in a difficult position, does it not? The Rams would still be in position to move in 2018, but unless the Carson project also begins construction they would fall at least two years behind Inglewood. Plus, as someone above hinted, Goldman Sachs would have to strongly reconsider their investment if the Inglewood stadium is actually build. They could move forward, but this is a pretty high stakes poker game being played (and one that Kroenke would only undertake if he was prepared to sue the league if necessary). When they vote again at the end of the 2016, Inglewood is half built and only a year away, Carson will have lost a lot of steam, and the fact that St. Louis has a plan in place could be mostly be an afterthought. If the NFL wants a team in Los Angeles, and Kroenke can maintain enough votes to block Carson, then I think he eventually wins the race
if he cannot be talked out of the LA project. The key for him is maintaining enough votes to block Carson and having the autonomy to move forward with Inglewood and maintain the headstart he already has achieved.