Honestly, you want a simple, widely accepted, heavily west-biased source? Literally just read the wikipedia article.

“[CBS and WP journalists] could not find enough evidence to suggest that a massacre took place on the square”

“cables from the United States embassy in Beijing agreed there was no bloodshed inside Tiananmen Square”

Nobody here is denying there were protests, or that a limited number people died in clashes with police across the country. But literally no reputed source, western lib or otherwise, claims that the government was out in Tianenmen killing civilians in major numbers.