Well life is a rush for time nowadays, as now time is money. WE ARE BEING governed by time. At a certain time we need to clock in to work, clock out, clock in, and so on, unless of course we are one of the elites with some resources and assets to work for you. For the lay people like us without any of their blessings, we have to subject ourselves to slavery by time to arguably a much more significant degree than these elites.
9am work.
6pm end of work.
7pm actual going home time from finishing Some 'extra work'
830pm home and time for your loved ones.
10pm settle All necessary home reproductive work.
11pm hopefully everything is done and can go back to sleep.
7am wake up to prepare to work.
My point is that since we are being 'governed' by time, its only natural that we try find some time wherever we are to complete our tasks, and some people, unlike you might have other 'extra' commitments in their lives (children, 2nd job, Ageing and ill parents, or something like that) which make it rather impossible to squeeze all those in one day and that it is almost impossible to say for sure whether one is morally (im not talking about law here) wrong or right.
In short everyone has 24 hours but not everyone has the same workload.
I too sometimes mark papers in the train, get my cam gear ready in the train, wear my contact lenses and hydrate myself for the weekend football matches in the train and so forth. Right or wrong you decide, but if you cant see anything beyond the lines and black and white of the law, then i think in my humble opinion that you are missing out on something.
Cheers