it's ok to be frustrated because traffic is slower than you think it should be, but you're still responsible for your own response to that frustration. if you rear end someone or slam into their side because you want to make a point that's definitely not their fault. they didn't force anyone to drive like a weenie boy
that being said, if everyone around you is going 60 even though the speed limit is 45, you should probably also go around 60. if you're getting mad because someone's going 65 in a 70 and you just want to go 75, i'd say that's pretty silly.