I don't think using swear words indicates a lack of intelligence, breeding, education or morals. A well chosen swear word can be just as appropriate to the situation as other emotive or strong words. I don't choose to use swear words in front of children, although over the years they have overheard me, but they have also overheard me behaving responsibly and not slagging people off or disclosing information that should not be imposed on children. We can get on our high horses about swearing, but ignore other behaviour that would be better addressed.
Three of my four children swear every now and then. The other one is so placid that she rarely feels the need to use strong words. None of us use swear words as a way to be aggressive, but generally for humour or emphasis, and not that frequently.
I watched an episode of Celebrity Big Brother with my daughter the other day, and we roared laughing at Rylan Clark, who does swear a lot, but called Razor Ruddock 'you cheeky f***er' in such an affectionate way, no-one could possibly be offended by it. A very funny moment 