You can use Insight to jump start another car quite safely if you follow proper procedure.
The risk of damaging your own car when jumpstarting another car could happen to just any car, not only Insight. And the risk is higher if:
1) Your car have a lot of complex electronics.
2) Your 12V battery is of a smaller capacity.
3) The car your trying to jumpstart have some electrical fault e.g. a short-circuit or a very badly damaged battery.
When you link the jump start cable from your car to the target car, DC current will start to flow from your car to the target car. That's draining your 12V battery (if you had not started the engine of your car), or putting stress to the DC-DC converter (or the alternator if your car is non-hybrid).
From my point of view, a good practice to jumpstart another car (not only from Insight, this is applicable if you are jumpstarting from any hybrid or non-hybrid car):
1) Make sure all the electrical load on the target car is switched off (e.g. lights, wiper, heater, aircond, stereo). And make sure you have a proper jump start cable (some low quality jump start cable being sold cheaply at hypermarket heats up considerably when large current flows over them, make sure the insulation is not damaged, touching a 12V +ve cable to any part of car body or engine surface will means a real bad short-circuit and frying of electronics.
2) Inspect the 12V battery of the target car, make sure it does not show any physical damage e.g. leaking, swelling, terminal corroded badly or low in electrolyte in each battery cell (if wet battery) or the battery health indicator showing 'bad battery' instead of 'recharge require' (for maintenance free battery, usually they have a status window).
3) Start your car engine first, make sure all electrical load on your car is switched off whenever possible.
4) Have someone sit in your car and rev up the engine a bit. for non-hybrid, usually rev till 2k rpm should have the alternator spin up to produce enough extra current. For hybrid, you probably need to rev the engine to the point the IMA is charging (since the 12V power comes from DC-DC converter from IMA, Insight don't have alternator, remember?). By doing so, you will make sure your 12V side have enough current being generated to top up what is used for jumpstart, rather risking over-discharging your 12V battery.
5) Connect the jump-start cable. (If you do not know what I mean here, stop immediately, you are definitely not technically equipped to perform a jump start procedure).
6) Do not immediately start the engine of the target car, leave it for 30 seconds or so in order for some charge to accumulate in the target 12v battery first, so when you start the target car after 30 seconds, the stress to your car 12V would be a bit less cause some charge have built-up on the 12v battery of the target car (if the target car battery is only discharged e.g. forgotten to turn off lights, and not damaged or having internal short-circuit).
7) If the target vehicle start, then just disconnect the jumpstart cable and skip to line no. 9. If after a few crank failed to start the target vehicle, wait a while before trying again. You will notice the jump start cable will heat up due to transfer of large amount of current.
8) If a few more attempt also failed to start the target vehicle, its better to call for tow truck or go buy a new battery to put into target vehicle. There might be some other fault in target vehicle that if you keep on trying jump starting, it might also damage your car.
9) It doesn't stop here. If your car battery is not new (e.g. more than 1 1/2 or 2 years old), it is better you leave your car engine running a while even after you disconnect the jumpstart cable, cause your 12V may have been exhausted and needed to be top back up. If you just shut off your car engine with your 12V exhausted, it may cause permanent damage to your 12V battery (long story, I had explained earlier in some other post that unlike marine battery, cranking battery used in car will be permanently damaged if left in discharged state.
Looks very complicated rite? Well, I cannot guarantee that if you don't follow above procedure, your car battery will 100% get damaged, but if you have no choice and have to perform a jump start, then the above could somehow reduce some risk of hurting your own car for doing a favour to help another car.
Good info. Thanks.