Any high grade imbecile knows the ignition switch should be a dash-mounted spst
20a rated toggle, not a impossible to diagnosis electronic module.That way, if you suspect a bad switch, you can jumper it with a piece of 18 ga zip and two alligator clips if the problem goes away, youve solved the problem without the benefit of a VOM or even a Sun Master Tester.
Dont worry about vehiclular theft. We have strong grand-theft felony laws against that peril. Laws work, thats why we have strong gun control laws, isnt that so?