Full Idea
Mathematicians are uncomfortable with computerised proofs because a 'good' proof should do more than convince us that a certain statement is true. It should also explain why the statement in question holds.
Gist of Idea
Computer proofs don't provide explanations
Source
Leon Horsten (Philosophy of Mathematics [2007], §5.3)
Book Reference
'Stanford Online Encyclopaedia of Philosophy', ed/tr. Stanford University [plato.stanford.edu], p.26