Why does that scare you? The commenter made an honest disclosure of a relevant activity, indicating that they have strong feelings about the subject. Discouraging such disclosures doesn't prevent parties from having strong feelings, but rather may encourage them to conceal their motivations. People can have feelings, and still maintain honesty in their arguments. Expecting everyone to have a detached objectiveness might be ideal (or might not), but is an unrealistic expectation; entirely impractical in a public debate.