Despite your colourful language, you are right, it's your country and you decide who to let in. We did that by BREXITing a few years ago. It's interesting for me that social media has become the credential battleground that countries are using. The original use of the "Visa", which pre-dates the passport was as a personal guarantee from one countries authority to another. Now a TikTok meme can be make or break for immigrants. How far we've come.