Will it return to a good work environment again?

My short time being a nurse I have seen so much in the last 2 1/2 months. I love the place I work and loved the people I worked with until last night when I was witness to my evening supervisor verbally be abusive to a resident by degrading her in front of numerous staff several times. I have played it over and over in my head and am left with the look on her face and her broken body language that screamed helpless. I couldn't sleep last night at all and keep thinking I wish I would have just said thats it... everyone out of the room. Right after it happend I wrote everything down. exact phrases that were said. What was said afterward,etc. I did call this am and reported to my ADON who had me come in and give my oral and written statement and the investigation was started. I don't know what happened. I know they ?'d the resident as well as the cnas that were present. The DON came and casually stated, the evening supervisor will not be here tonight and someone will be covering the dining room. Of course then the gossip or the truth started. I don't know.. I think some of the truth was mixed in with lots of extras. and i had every cna on the unit pulling members from housekeeping and maintenance, basically anyone who would listen in on this. then, i had to be the "b****" they made me out to be by telling them to answer call lights and it doesn't take 5 people to pass one tray down the hall when there are lights on the other 3 halls going off. The 11-7 crew came in and stated they received over 20 calls about the situation that the supervisor was fired(although I don't know this to be true or if they just put her on leave until after conducting the investigation). I am sure everyone knew it came from me because it was written all over my face last night after it happend. But, I knew when I reported I would be prone to such behavior. Funny thing is... very few people liked her. She was tough and crossed the inappropriate line several times with employees. It was bound to come to surface to a resident and I am sure has had in the past, but not reported. Tonight was horrible night. Although I knew this would happen, it's a lot harder when it is happening. Do you think it will get better as time goes on? Do you think they think I am trying to get everyone fired? I wasn't.. I actually learned a lot from the supervisor that did this. I believe clinically I probably learned the most from her. I just did what I knew was the right thing to do. if I didn't report it I would be just as guilty as she was and that I could not live with. I will tell you what was worth it though, when i first was on the unit tonight, the resident was sad and withdrawn and had such sad eyes. when the managemetn left the res. room after ?ing her and I walked in you could see on her face she was relieved and smiled the rest of the night. That is worth all this hassle and what is still left to come... any advise on if it is going to get easier?