Quite true, in general terms, one person's (being PC here) terrorist is another person's freedom fighter.
However, if you are using unconventional tactics to rid YOUR country of tyranny, that (surely) is quite different from inflicting huge damage on the civilian population of ANOTHER country simply because you don't like them or are jealous of their way of life.
There is also a considerable difference between those who seek to INFLICT huge numbers of civilian casualties (relatively easy to do) and those who seek to AVOID huge numbers of civilian casualties.
