I think the genetic component of cancer depends very much on the kind of cancer one has. Lots of other conditions have a strong genetic component - poor cardiovascular health, depression, schizophrenia, alzheimer's, strong disposition towards substance abuse, etc. I would not call it "worse" than for example the genetic likelihood of 80% of developing alzheimers at an early age (which luckily I don't personally have).

Perhaps this is a very personal view - but as I've lost relatives to all sorts of maladies including cancer I find it really hard to see cancer as the absolutely worst bogeyman in the room. That's not to say it's not bad.

Luckily, there's no evidence that it really runs in my family genetically. The threat still becomes more real as I have witnessed it.