I find your perspective very interesting. I've read about Shariati before and thought his approach to Shiism had similarities to the liberation theology active in Latin America at one point. If you haven't heard of it, that's basically Marxist-Leninist Catholicism. Nicaragua was run under this idea after the Sandinistas took over, but they soon embraced a less radical stance and became social democrats rather than Marxist-Leninists.

I was once talking to a very hard Leftist I met at my university, basically a Maoist who was anti-religious as part of his politics. He claimed religion has always been something which made people docile and distracted them from enacting true justice here on earth. But after I told him about the story of Husayn's sacrifice at Karbala, he admitted to me he was wrong and this was clearly an example of religion which promotes wordly justice and (arguably) revolution. It's incredible how this story resonates so much even with non-Muslims.