Don't see the problem with closing ticket offices to be honest. Tickets can be bought online or at the machines in the station. Plenty of stations already don't have a ticket office and seem to function without problem.
I haven't been in a ticket office for years though, so maybe I'm missing something.
Your missing the facts.
1)unmanned stations are inherently more dangerous. An app on your phone for tickets is fuck all use if you are being mugged.
2)Not everyone is proficient in using technology especially the older people. If they close the ticket offices my mother for one will have to stop using the railways.
there are loads more but will start with those two