Safe is always relative. If you don't think the vaccines are safe enough, then please also be consistent and don't engage in equally unsafe activities, e.g. don't drive a car, exercise regularly, eat healthily, don't encourage your girlfriend/wife/daughter/friend to take the contraceptive pill or, even worse, get pregnant, also do not take a large number of other drugs etc.
Again, from what we know today, it is safer to vaccinate your kids then driving them around in a car. Even when the risk/benefit profile is even/negative, absolute risk is super low.
