I’d prefer to not use propaganda at all and instead be honest with people:

• Vaccines reduce your risk of getting serious illnesses, and if you get them anyway they tend to be mild.
• Without vaccines, many people will get ill, many will be hospitalized, and many will die. Some will have permanent medical problems or even disabilities. We have no way of knowing who exactly these things will happen to until after they already get sick.
• Most vaccine-preventable diseases have little to no treatment options after you get ill other than just waiting them out. Antibiotics do not work for most vaccine-preventable illnesses.
• Vaccines have been medically proven to be very safe and very effective.
• You can only catch a virus if someone else gives it to you. By getting vaccinated, you are protecting not only yourself, but all your friends, family, coworkers, and everyone else important in your life.