I'm probably just being dumb right now, but I'm posting this on the off-chance I might actually expand my vocabulary.
When you say "eggs are bad" or "X is Y" it is not always assumed that "I think" is inherently built in, but sometimes it is.
Furthermore, if you say "eggs are bad" to a 4 year old kid, one implants an opinion about eggs into that kid, because they are impressionable. But if you say it to a 75 year old, they might want to know how you've formed that view, or more likely what you want from them or yourself by saying it.
So if you're going to say "X is Y" without 'I think,' at least say it to evoke an agreeable reaction - like at a Vegan conference if talking about eggs. Or else where opinions are fluid.
I think I am right.
<noun> is the devil