Bad Management Supports Bullying

I witness someone stealing at work, it's considered theft and then when I reported in HR, they gave me a warning letter of harassment and malicious act. I was so depressed and I felt humiliated to the whole organization because they didn't consider my report of stealing hours at work.
The people that involved in this case are still working. I emailed it to someone who's member of trustees and they humiliated me more. I came to the point where I was mentally stressful everytime I work there.

Mentally stress because I am thinking all the time, what they going to do next... after 2 months, someone complained about me for nonsense and I got another written warning letter... I felt I was the target of the whole organization, but I will wait till they kick me out, I am not giving my resignation, I'll wait till they give me a termination letter. The management were using their power, including the human resources, they are all one, like politics, they always side to the people who ripped them off.

There is no evidence but people are talking about it about the favoritism, who's receiving gifts from employees but I believed in karma so I just want to see how it works.
They are going to kick me our soon but for sure nothing lasts when you're in bad management.