A provisional ballot is used to record a vote when there are questions in regards to a given voter's eligibility. A provisional ballot would be cast when:
The voter refuses to show a photo ID (in regions that require one)
The voter's name does not appear on the electoral roll for the given precinct.
The voter's registration contains inaccurate or out-dated information such as the wrong address or a misspelled name.
The voter's ballot has already been recorded
In the above the reason for a provisional ballot is that the voter has violated or ignored regulations or laws in regard to voting.
The question boils down to why have rules, regulations, or laws if they can be avoided or worked around.
Do you favor this voting method?
Is it the voters responsibility to register properly and obey the laws?