Lies and misinformation can be countered with truth, and if that doesn't work there's always the ignore button.
Agree with you.
Ignore button is good to keep spammers out of sights and liars out of non sense discussions. For spammers I only ignore. For people who can discuss with, I use the feature to block DM as well because with these ones, public discussions or DMs don't solve anything. Just kind of wasting time and bringing some unnecessary emotion.