While I understand and empathize with your plea, there are several things you may wish to take into consideration:
1: Humans have historically been violent and nothing has substantially changed in the past 6000 or so years which would cause a shift to a less violent society.
2:The Constitution does not "give" us rights. It enumerates them. In the enumerated rights, there is no "right to informed news".
3:The only person on earth who really knows what happened is the trigger-puller, and I don't think we'll be hearing anything from him in the foreseeable future.
4:The Main Stream Media exists for one reason: TO MAKE MONEY. It's their job to keep people mis-informed, mal-informed and emotionally incensed about a given topic and spin it to keep people comming back for more. IT IS NOT IN THEIR FINANCIAL BEST INTEREST TO INFORM VIEWERS. Their best move it to let it trickle out, maximizing viewership and profit.
5: Law enforcement isn't there to provide a play-by-play for the populous.
6: These things happen. It's quite unfortunate, but it's a fact. Many generations in every country in the world has had similar mass killings. Many of the mass killings were worse than what happened in Las Vegas. We were fortunate it wasn't worse.
My heart goes out to those affected, but it is not in our best interest to allow our "feelings" to over-ride the facts, which we know little of.
Keep Calm and Carry On
RE: Deadliest Single-Shooter Attack in US History