Aligning a column to the left has to do with Accessibility.
Left-aligned columns of text are easier to read for the users with disabilities like dyslexia as the uneven space between characters in the left and right-justified can be difficult to understand.
According to WCAG SC# 1.4.8
People with certain cognitive disabilities have problems reading text
that is both left and right justified. The uneven spacing between
words in fully justified text can cause "rivers of white" space to run
down the page making reading difficult and in some cases impossible.
Text justification can also cause words to be spaced closely together,
so that it is difficult for them to locate word boundaries.