is my tranlation right?

"al hacerlo demostraron gran coraje personal, tanto porque desafiaron a una poderosa maquinaria de propaganda sostenida por grupos de interés locales - gobierno incluido - fuertemente ideologizados, cuanto por el contraste que marcaron con los que - por cobardía o mera conveniencia - han preferido guardar silencio."

My translation:

"In so doing  they demonstrated great personal courage, both because they challenged a powerful propaganda machine supported by local interest groups - including government - strongly ideologized, and because of the contrast they marked with those who - out of cowardice or mere convenience - preferred to remain silent."

Thanks