Whether they are easy to get or not has nothing to do with it whatsoever. The point is, is it acceptable to allow someone to possess a weapon that has no other use, which can be used to kill whole large groups of people? The answer is unequivocally no.
I get the point about the logistics of transforming a widely spread gun culture into one where they are banned, but something has to be done. The status quo is unacceptable and with time, effort, and effective enforcement of law, banning guns will have a considerable effect.
Smuggling and gang-warfare would be a problem, but those are issues that are happening anyway and need to be dealt with. With effective policing, effective education programmes and effective tackling of social inequality, gang violence can be tackled, but this is a whole different issue.You can't just ignore the high gun-related death figures in countries where firearms are legalised because it might inflame other areas of crime.
Just replace the word 'Gun' with 'Bomb' and you can see that the very idea is insane. Would it be ok to have bombs legalised because it would reduce the risk of illegal smuggling and terrorist gang war-fare?
No. That's mental. It's mental to have any form of artillery legal.
And as for the idea that burglary and property damage would increase, I think you are wrong. If anything, I would predict that if it became harder for people to get guns, then they are less likely to have the confidence to actually carry out the crime unarmed and therefore you would see a fall in such crimes.
Generally, guns cause more crime then they prevent.