Vaccinations

When I asked how the unvaccinated could harm the vaccinated, I was told that the unvaccinated is where the variants develop. Upon researching this, I find out that the variants can develop in both the vaccinated and the unvaccinated. Many people who are not vaccinated are coming across the border and being dispersed throughout the country. These people are put on buses supplied by the government and sent to different cities. Videos show that many of them are not wearing masks and certainly not social distancing. Most of these people are under age 65 and may be asymptomatic especially the younger ones. Will this cause the spread of the virus? Has politics so infested this subject that it no longer matters if the virus spreads just who spreads it.