Yes but if there is a bad connection the car will die because the battery cannot supply the spark plugs.
I don't believe that's true, most cars will run solely on the battery until it dies, and will run on the alternator independent of a battery. In this case I don't think it's a current
supply issue. Getting there maybe, but not
supply.
That said...
Now that I re-read your thread, it's not a failure to start problem, it's a failure to crank problem. You don't have a fuel delivery issue. First choice, corroded connection. If it is a corroded connection at the battery, it's not a tightening issue, but a cleaning issue. If the battery is low enough, and you are using light enough jumper cables, the battery is going to take the jump current and still may not be enough to crank. A good, fully charged battery may crank, but still not start the engine if the starter is bad, even t I have had this happen on many cars, and it was the positive side that needed to be cleaned. And while you have the connectors off the terminals, for good measure apply di-electric grease.
Do this:
1) remove and clean battery terminals and clamp fittings, if that doesn't work,
2) remove THE battery, have it charged and checked, re-install and if it's still only clicking,
3) remove the starter and have it bench tested, at that point if the starter is bad you can probably have the shop that tests it, rebuild it as cheap as you can buy a reman, maybe cheaper and re-install.
At this point you should have the engine cranking.
If you get it to the point of cranking, and it won't start then you do the basic tests for ignition and fuel delivery, spark at the plugs, fuel on the plugs. But you have to get it cranking. Actually I think when you have resolved the power supply issue, you will be up and running.
M..