Yes yes I know language changes, but that doesn't mean I'm not allowed to be annoyed at a language trend that is damaging the ability to convey or even conceptualize information.
"Prison labor is a form of legalized slavery and that is bad." 
"That's just morals. To each their own." 
The implication of "morals" as a summary of ethical and philosophical discourse tends to lead to such "morals" being dismissed as irrelevant or even irrational because they can't be measured in a test tube in a laboratory environment (neither can the concept of logical positivism but that one gets a pass).
Less commonly but still in existence is this version that is used by right wingers for a different but still grating purpose.
"The problem with society today is there is not enough morals. That is why bad things happen. There needs to be more morals in the family and in the school." 
It's still a crude summary, but one with even less philosophical consistency, that takes the already crude idea of "morals" and turns it into some kind of currency of goodness that is measured between those that ostensibly have a lot of it 
and those that don't. 
Ok im gonna be 100 with you Im not even sure I understand what moral relativism really means. I just stated that I dont care "much" for the concept of morals because I feel its often used to deny minorities the right of self defense because when black people fight back and its not a toothless protest its amoral. Im not a man of learning but Im open to learn... so feel free to enlighten me if you have anything else to say.
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My point of contention and the point of this thread is when all such discussion, that you just mentioned, gets crudely and roughly packaged as "morals." This can be done to dismiss all such discussions (which does class struggle as a leftist concept a gross, treacherous disservice. Why stand for anything as leftists if we can't even stand for that?) or it can be used to weaponize them into a crude superiority currency where chuds say they have "morals" and we (slurs here) leftists don't.
Without the blocks of TL;DR links, I'll say that you seem to have a cool and good ethical foundation already because you see the class struggle inherent to our system and value people over codified (and easily exploited by those with means) codes of conduct that typically say it's always wrong to use violence against violent threats (and what is a police force, or a military, but a legalized monopoly on violence?).