I think this is confusing past and present tenses. The 61 airlines
at the time didn't undertake an adequate risk assessment. That is not an indication that they are
currently in the same position. What we don't know is whether MH has changed the position it maintained after the downing of MH17, which was that it should have no responsibility in making risk assessments over which paths are safe, and which aren't.
Of concern in the abc news article linked by
drron (above) is that SQ is saying it only uses routes 'cleared by authorities'. Is that 'ICAO/EuroControl' or 'Singaporean intelligence' authorities? If the former, it clearly ignores the findings of the Dutch report into MH17.
A class action is being mounted in Australia against MH's flight path:
MH17 news and report 2015: Aussie families in class action with Shine Lawyers
I think passengers have a right to know the policy of individual airlines with respect to flights over [potential] conflict zones. Ultimately that might mean tickets are refundable/changeable in the event a passenger is not satisfied.