Heavy Equipment Operator sentenced to 7 1/2 to 15 years in Philadelphia

Deadly scene in  Philadelphia over building collapse back in2013

A heavy equipment operator was sentenced to 7.5 to 15 years over an accident that caused a thrift store to collapse, killing 6 people inside the store. See full story

http://abcnews.go.com/US/wireStory/latest-families-worry-collapse-victims-justice-36165745The contractor got 15 to 30 years.

Do you think the sentences were too harsh or were they justified, given the loss of many innocent lives?