conecting a safety wire is good because it is a safety wire and it makes the aeroplane sFER

safety ground

Rwanda ko

the wire is Yellow coming out of the ignition switch going to the Neutural safety switch, then purple from the neutual safety switch to the starter

I think you mean the GREEN or GROUND wire. On a tool, it is intended to take dangerous electrical currents, and safely carry them to ground (instead of going through you) -It is also known as EARTH WIRE ...