This is fundamentally incorrect.

Vaccinated people have a lower viral load, thus are less contagious, thus lower the R1.

If the r1 is below 1, then you eventually get to herd immunity. The more vaccinated people there are, the less dangerous the disease is, and the less contagious it becomes.

Herd immunity is not binary: it's a gradient, and if you are on the right side, things get better.

Even if vaccinated people can contract the virus, they are likely to fight it off relatively quickly and keep the virus load in their bodes low, keeping their chances of transmitting it much lower than an unvaccinated person would.

Lets say being vaccinated halves your chances of passing on the virus compared to an unvaccinated person. If almost all the population get vaccinated, we can ease the lockdown to the point where we tolerate doubling the chances of re-infection. The lockdown easing and vaccination effect should cancel out. If vaccination reduces your chances of passing on the virus by 10x, then we can tolerate a 10x increased risk due to easing lockdown measures.

Worst case we may have to retain some limitations in social contact for a bit longer, but hopefully nowhere near as onerous or we've had to so far.

But if the vaccines don't prevent infection, you won't achieve herd immunity until 70% have been infected one way or another.

It may well be that having already been infected doesn't prevent you passing on the virus, in exactly the same way.

Whether your immune system knows how to fight the virus from previous infection, or from a vaccine, it can take time for your immune system to kick in and fight of a new infection. During that time you might be infectious.

Israel data doesn’t make this look to be the case. I don’t see any evidence this is the case.

Which is a huge problem.