Can you name a single state with voter id laws on the books that does not offer a free form of ID suitable to vote? Reminder: a _drivers license_ and state-issued ID are _not_ one and the same.
The easy-to-get is also important. Plenty of people who absolutely are citizens, born in this country, lack things like birth certificates or social security cards, and getting one can be a huge pain, sometimes requiring significant travel and expense. Often these are older people, or the homeless.