When a politician resorts to calling for a referendum, it's very exactly admitting s/he cannot take the issue in charge.
Elected people are supposed to be most responsible persons, carefully selected to take in charge unexpected problems to come -not jupt people that'll call referendums for any new problem.
Otherwise we can as well replace them with automated polling machines.
I for one am not at all for direct democracy, in which obviously the majority of voter do not know all consequences.
Ideally we should vote for people we really are confident in, whose curriculum among others should be convincing -but there are fewer and fewer such, perhaps because of the way political parties work, perhaps because of the way media raise our attention (only to the most shocking out of them, etc.)
Direct democracy elects Hitlers.
This, said by a French citizen, whose country's referendum directly voted against the European Constitution, a mark I'll keep till my death.