How common is unethical behavior at companies and how should I deal with it?

I have worked at 2 companies and I keep seeing unethical behavior.

First one was for a large "well respected" German Semiconductor company. I had a Engineering Mentor falsify data (test a good part and use that as data for a bad part submitted by the customer). I had a Manager who admitted to insider training. Both these people kept their jobs while I got laid off. I did not report it out of fear of repercussions.

At my current employer, my Manager lied to me during the interview process. He said I would learn a tool but that never happened in ~3 years because that tool was broken / not calibrated. Former coworker lied about his credentials which was an important factor in me accepting the position (lied about his Seniority at previous employer so I thought he had more experience than he actually had...), and when I confronted him later, he tried to gaslight me. One coworker admitted to cheating on Senior EE project. Also, we were told to sign documents for training even though we did not get properly trained, I think for purpose of audits...

I want to quit my job, but I also don't want to become homeless...

How common is unethical behavior at companies and how should I deal with it?
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