Saying that America just controls "Israel" is almost us much cope as the other way around. It's not antisemitism to say that the "Israel" lobby has more influence and less limitations than other "puppet" states.
America could threaten to withdraw support and "Israel" would fold instantly, but American politicians almost never do this, even when "Israel" acts against their interests. "Israelis" do actually have some influence on America and "Israel" has a degree of autonomy not offered to puppet states. That doesn't make America less guilty, it's still the case that they could stop "Israel" at any time. The fact is that they generally don't, even when it would be in their interests.