Ideally, meditation would spur you on to action; that's the direct aim of engaged Buddhism [1]. But more broadly, many Buddhist schools aim to encourage a direct feeling of love for all sentient beings, which if combined with the philosophy of something like effective altruism [2] (instead of Woo), could contribute to effecting meaningful systemic change.

Also -- I believe Buddhism does not apply negative connotations to 'indignation' as opposed to raw anger, i.e. I don't think it is classified as a negative state of mind to be dissolved.

[1] https://en.wikipedia.org/wiki/Engaged_Buddhism [2] https://en.wikipedia.org/wiki/Effective_altruism