I can get behind your idea to "disperse that freedom to the people and let them do what they want" because the government in the US right now isn't working for good people. But I understand the spirit of what you're conveying and believe your intent is in the right place.
They can come through any US border by foot and I think by boat and not have a covid vax requirement. Problem is, the shipping industry requires (or used to) submitting to the vaccine. When you get scooped up by CBP and put in ICE's sub-contracted detention centers, those agents press and press to get immigrants to submit to the vaccine. When the immigrant doesn't submit they detain the immigrant many days longer.
The tricky wordsmith gymnastics about crossing is only buried in the Canadian area of the website documents. The majority of people only go searching through the Mexico area of the website so they miss it.