Most companies pay too little tax because of Ireland’s laws. That should be changed. No fair doing this retroactively, though.
If they change the rules going forward, that’s their prerogative. These companies have been complying with the Irish rules. Now a lot of them will have to re-evaluate their relationships with Europe.
https://www.theguardian.com/technology/2016/aug/30/apple-eu-tax-bill-silicon-valley-response