Was Fortinbras right in his statement?

I personally think that Fortibas was partly right and partly not. I say this because if you look at it from one perspective, Hamlet was doing all that he did because he wanted to stay loyal to his father, who was also the royal king,  and take revenge for him, which in those days was perfectly alright. I think that although what Hamlet was doing might have been for a 'good cause', the way he went around things was wrong. His mission was to kill one bad guy and this turned into killing nearly everyone but 2 people. Not only did he's attempt of killing his uncle lead to the death of his girlfriend which he loved although he didn't really show much affection towards, but he's attempt also lead to the death of her father, brother and his own mother. However, the other perspective which you can look at is that all the tragedy deaths was not directly caused by Hamlet but in fact Claudios as the murder he committed was what had all these knock on effects on all the other deaths and therefore Hamlet can be looked at as someone who was trying to do the right thing, a real 'soldier'.