Down votes are for poor quality posts and comments. They are not for things you disagree with unless it’s also a bad post. It’s also for community enforcement of rules and norms.
Examples: “Hitler did nothing wrong”… Down votes and report to moderators.
What about Obama violating the Constitution killing Americans without due process. He stayed president so Trum can to. - down vote and explain the logical fallacy.
Pink and magenta are the same color! - down vote because it’s factually wrong.
Thomas Kinkade is a great artist! And here is why … - up vote and comment on why you disagree and try to encourage discussion.
Skunks smell good! - up vote and discuss how some people have generic difference that make skunks not smell as bad.