Debate on Maratha history is still going on[1] other chapters of history is yet to be opened and taught.
> Far from it. Mongols, Christians, Huns ... I will run out of space if i have to keep mentioning all the ones that I know of.
Mongols were pretty inclusive and tolerant towards religion until they converted to Islam[2]
Hunas never succedded in invading India. I am not sure which history you have read. Last hun Mihirakula was defeated by Yashodharman and he too was a Shavite.[3]
Christians represent same Abrahmic idea so yes they were also brutal towards other religions but not to same level.[4]
> Might it be a projection of a collective low self esteem felt by a class of people who got left behind economically and culturally
Are you sure I am culturally "left behind"?
[1] https://timesofindia.indiatimes.com/city/pune/Maratha-histor...
[2] http://afe.easia.columbia.edu/mongols/history/history7.htm
[3] Rajtargini by Kalhana
[4] A Self-Study Course on Political Islam