Marines arent actually tough?

ok so i always hear that marines and army men who kill never like to talk about it and if they do there probably lyine yada yada.... well i was in norfolk and hung out with some seals for a day cuz my sisters married to one and i was visiting... man those guys are bad ***! they were openly proud of how many guys they killed, most had a pretty good if not exact amount of how many they killed i mean these guys are Reapers they get what ever it is they are after on a mission. none of them had any ptsd or had anyone on there team who got ptsd. how come marines talk super tough have a hard boot camp but dont like to kill? is it because seals train 10 times harder to go to war so they have no hesitation about what there doing?