This sounds like e9 vs e4 IxFPs, but the e4 is off a bit. I'd describe "justice seeking" IxFPs as being vocal & firm in defense of something (but probably not pro-active), less conflict-avoidant than 9s, being autonomous & open to defying the status quo in favor of an ideal, but not pushing it on others, leading passively by setting an example, acting out of moral indignation but probably "quietly", etc. The type you describe sounds more obviously leader-ish, and while IxFPs are capable of leading, most prefer not to & seek independent roles (not wanting to be led either). The IxFP who is vocal still likely does it through an indirect channel (ie. art or the written word). The IxFP who takes action likely does it as a reaction to some violation. It's a quiet, indirect way of being firm.