> Why is that less of a risk than allowing foreign tourists in?
All countries balance risk v. economy and voter satisfaction. Also, a country has certain obligations towards citizen. Every country does that, not just Israel. Practically speaking, you can hope that the citizen will go home and you can even ask him to stay home. The tourist will roam around immediately. Also, I believe Israelis returning from certain “red countries” are currently subject to quarantine.
Anyway, you can always argue on particulars of a particular decisions in each country, but that is why the countries have governments to make some reasonable decision, and you have a right to appeal to a court or vote in next election. You should not get too much upset every time you are not in a majority on an issue.
And, also, as R Meir Twersky wrote early on, politicians are bound by the desire to be re-elected, so Jews who value life more than economy and tourism should be more careful than they allow.