.
The same tense is not demanded throughout a narrative, but there must be good internal reasons for the shift; here there does not seem to be:
This shaped his perspective...and developed into hostility.... The lower class...is subjected to...and kept impoverished and disempowered.... The government ignores the suffering...and forces them.... [M]embers in the Trueba family became sympathetic...and devoted....The first and last sentences (the effects on the protagonist) are, if anything, consequent upon the past actions in the central pair of sentences. Alternatively, if the last three sentences only speak of the story itself, my assessment holds for the last sentence. As another alternative, the first and last sentences may relate to the author while the inner pair to the story itself; the tenses then may be appropriate.
All in all, when tenses are switched, confusion reigns.
.