I'm thinking of quitting my job at a time when my bosses really need me.
Why are you thinking about quitting your job when your bosses really need you?
My bosses won't go out of their way to help me resolve workplace issues and it's very frustrating.
Working for uncaring bosses can be very frustrating, but you shouldn't just walk out. If your bosses really need your help then you should stay, but put in your two weeks notice. It's important to leave a job on good terms so that you can get a good reference.
My bosses don't care about me so I have no responsibility to care about them.
You still have a responsibility to be a good employee even if you don't think you've been treated fairly. It's fine to quit your job if you can't resolve your issues but you have to give them your notice so they have time to replace you.