“If you already suspect gas is in your house then just get out(open door very gently).”
Yes! Do not turn on/off any lights, do not use a phone, just get out.
“If not then shut off the main gas valve(to kill some ignition sources).”
No! Only a properly trained and certified person (gas company employee, fire department, or plumber) should operate the gas service stopcock. If it’s an old plug style stopcock, it doesn’t have an internal stop that stops movement in full open or full closed position. So if the valve is not fully closed you’ll have blow-by.
“Shut off the main electric breaker(to kill more ignition sources)”
NO! By doing this you can create a spark.
“and open all the windows.”
NO! By doing this, if there is gas blowing outside the structure, you now make it easy for gas to enter the structure.
The explosive range of natural gas is 4% to 15% gas in air. Opening windows and doors with gas already inside the structure you can cause the gas to reach this range and cause an explosion. Let the gas company or fire department vent the gas from the structure.
Best advice is just leave. Don’t turn on/off lights, don’t make phone calls, etc. Just get the hell out and move upwind from the gas leak.
I am sorry but I already addressed your arguments as well. And I don’t agree. Are we men(or women) or mice. If you don’t smell gas then there is nothing wrong with taking steps to protect your home. The modern version is to be a snowflake coward. That is not how it always was. You have some personal responsibility, and a delay in securing your home while it is reasonable could result later in serious injury to your neighbors or emergency personal. Not just the loss of your home. There is an odor that has been deliberately added to NG. So you can smell it. And in this case I can guarantee that no one is coming to secure your home for hours or even days.
If you are not able to shut off the main then every appliance is Required by law to have its own shut off. Those are very easy to shut off and require no tools.
I was at a friends house several years back. There were only women there at the time. Outside on a deck attached to the house- they had a gas barbecue grill with wooden doors underneath. The propane was in there. The grill was being used and suddenly the was a loud bang. The doors blew open and flames were shooting out from a pressurized gas line.
The women were terrified and ready to just run. I immediately went out side and turned off the propane tank. The flames went out. And those women were very grateful, and thought I was so brave. But I rationally theorized that there was almost no danger of a pressurized Propane tank exploding from a external flame in that short a time. But if action was not taken immediately then very bad things could occur. The house could have burned to the ground. Fireman could be injured fighting the fire.
Do you think I did the wrong thing?