Littlefoot often seems to act on his instincts and emotions rather than logic.
We always know that Chomper would never do anything to harm his friends, but Cera and the others don't have the benefit of that certainty.
In LBT 6 it seems to be very tricky for him to accept that the others don't share in his enthusiasm for the lone dinosaur and rather than leading or convincing anyone he goes off on his own to break a tooth out of a supposed sharptooth corpse because his understanding of an old legend suggests that this was the right thing to do.
While I do agree that most of his qualities are somewhat based more on emotion (okay, all of them) I don't necessarily see that as a flaw. He is only a child. Before assumptions are made about his decisions, we have to take into account Littlefoot's age - I'd say he's about ten-ish, maybe eleven - and look at the norms for that age group. Around that time, they are entering into the concrete operational world, thinking more like an adult, able to use reason, but they are still children who tend to feel 'gut instincts' rather than think 'what is rational in the situation presented'.
One can't always be logical, especially if one is an impatient child

For Littlefoot, I imagine that the others look up to him. I see him as being motivational.
As for the views about Chomper, ever try to explain a hunch? Hunches don't work out with "hard, physical proof", they are merely a gut feeling, and Littlefoot felt that Chomper wouldn't hurt his friends (minus the tail-biting. Nature was still at work before Nurture took over). You can't reassure someone with a hunch, unfortunately (world problems would diminish if that were true

)
He's assertive, too. Which is something leaders need. But I admit his assertiveness does, as you say, 'go without logic'. Then again, logic does not exist to a child
