There is Always a Reason
To avoid taking action
Those who fear failure don’t just fear taking action on their own behalf. They often want to encourage others to avoid taking action, because successful risk-taking calls their own philosophy of inaction into question.
If I had a penny for every time I talked about trying X, only to have a low status guy in the vicinity try to take down the idea, I'd have a lot of pennies right now.
The mark of a quality friend is one who encourages your endeavours, regardless of their personal thoughts on the matter. No great man has ever concerned himself with the opinions of pedants and critics.