The vote button only captures agreement but not disagreement.
A hot topic with heated debate (due to flammatory title, etc.) that constantly pop up on page 1 could draw 100 votes and a less hot topic with more civil discussion could only draw 50 votes. We cannot say the former one is impacting more than latter.
You can have 100 agreed and 5000 disagreed and 50 agreed and 10 disagreed.