[SubuSS]

It is not usually about the employer, more about your management chain.

Yeah the company might have laid you off / have made bad moves, but the question is do you want to leave a bunch of your co-workers in shit without enough knowledge transfer etc. because you are pissed at some part of it. And yeah, these things come back around as well sometimes.

Tit for tat works between true equals, may be. In any case, You are not equal to a company. So yeah, they might not give a second thought about firing you, but as long as you want to be employed by someone in the same industry, burn less bridges :)