It's not something that should be taken lightly and it's not something you should do unless it's a last resort.
That being said, i went through the firearms safety courses and did all the necessary steps to be able to acquire a firearm here, it was through school, there was a chance we'd be working in remote areas with grizzlies and cougars, in many cases a firearm would have been necessary for protection. I chose not to get the license because there was not a situation where I'd need it.
I've met many gun owners in my life. Most of them were quite responsible and understood exactly what the consequences of wielding a firearm is.
Then there's those people who acquired them illegally who had zero regard for any safety when it came to their firearms and used them irresponsibly. I won't be around those people if they have their gun around.
As far as the protection aspect goes, if you live in a relatively stable country and area in the country low on things like home invasion and crime, sure it's probably not necessary.
Then, there's places like some areas in south Africa, where someone I know's brother lives in a fortified compound with automated machine gun turrets and guns stashed in every drawer because when the thieves come, they'll show up in a group armed with automatic rifles, cut your phone lines, and murder you and your whole family for whatever money or anything valuable you have.