If there are 100 trolls posting: "all birds are blue" you only need to refute it once and link "Are all birds blue? No" article.
5 minutes of damage * 100 vs 30 minutes of undoing
Yes, but there are infinitely more lies than there are truths. If 80% of lies result in a cache miss then you are in the same position. Especially when it is easy to create a lie that is very hard to disprove.
Cache.
If there are 100 trolls posting: "all birds are blue" you only need to refute it once and link "Are all birds blue? No" article. 5 minutes of damage * 100 vs 30 minutes of undoing