at the risk of starting an argument with CalJ, i'd like to respectfully respond.
yes you can be vaccinated and be carriers. you can unvaccinated and asymptomatic and be carriers. if you have active symptoms than you're more likely to spread it (that should be a given). not sure what your point was. my point regarding my 7 yo is simply to say that i don't necessarily say vaccination is the answer for everyone, depends on your risk profile. but you assume that risk. for a 3 or 7 yo their cells are constantly dividing and turning over. i'm not sure what the long term effects are in another 70 or 80 years their lives therefore i am hesitant. the risk of them ending up in the icu sick is much lower than you or i. therefore i chose not to vaccinate them (for now).
with regards the spread topic, one has to avoid equating "spread" with "active severe disease". the vaccine shortens the infectivity of an individual. meaning if i'm a carrier (vaccinated or unvaccinated) and without active infection, i have less viral load to spread. versus someone who has active infection, the viral load is higher and stays around much long and mode of transmission is more robust (constant coughing, saliva on hands and clothing). however if more people are out and about and start letting our guards down, the spread will worsen, in addition to the more infective variant. yes, hospitalization have both vaccinated and unvaccinated, but of the deathly ill are unvaccinated (~80%). i'm sorry but you can't argue the efficacy of the vaccination on individual benefits basis. millions have been vaccinated but at best we're 70% in the US (with most places in the US 30 to 50%), nearly 85% in Puerto Rico last i heard (active disease much lower there)... and its hard with constant migration of groups or individuals across state lines.
as to my knowledge of those patients, i'm not a primary doctor (those guys usually sit at the office and rarely touch active COVID patients), i'm in the hospital caring for acute patients (COVID and non-COVID) and a medical director of utilization in charge of reviewing all the charts of our group's admitted patients to make sure they're being cared for in a timely manner. so trust me... i know what i'm talking about when it comes to patients pre-existing conditions. yes, a 30 yo is less likely but is still at risk. when you see those three next to each other in the ICU you have to ask why risk when there's something that can minimize risk, just doesn't make sense.
lastly as a whole, we haven't reach herd immunity (that require at least 75% vaccination rate assuming all variants are equally susceptible to the response of the vaccination and the longer your spread out the period of vaccination from 6 months to severals years, you increase chances of new variation developing, alpha, beta, gamma, delta etc that may not be as affected by the vac), some may have natural immunity that why you yourself have never gotten sick from it. i've had a dialysis/diabetic/heart failure patients that tested positive on screening but have absolutely no symptoms from it. but if i had to make an educated guest, i think someday we may be able to nail down genetic susceptibility markers to viral infections (since the human genome has been sequence already). it's true, everyone will contract the virus, whether you have minor symptoms that your body just brush off like nothing (an the thought never cross your mind) or get very ill.
and yes i have credentials and work daily in the clinic and hospital setting with 15 years of experience. and i hope my experience and knowledge inform you... just as much as you, Cal, educate us on motorcycle mechanics, welding, electronics with your years of experience (all the stuff i work my butt of in order to be able do in my leisure). and i've read threads with people being rather rude to you for trying to give input on their build. i can be wrong as much as you, with our respective expertise. the intent was not to create hysteria (we have Fox and CNN to do that), merely to inform in a bipartisan manner.