I wish national laws were like the UN’s. When I don’t want to abide by a resolution I opt out or/and go my own way. Can’t have the oil and gas well opt out of the seabed treaty can’t go to war well ignore the security council substituting propaganda and lies to take the nation on board. Hype the nation as France, Holland, Portugal, Russia UK and America have using the restriction of patriotism (and fear) as method.
So the UN lacks the power, police and courts (and I guess jails and nooses) to enforce universal laws similar to those we have at National level.
Nations can and do say, "we say who comes here" or run their own little bully shops the latest perhaps the American Century.
Such national behaviour hyped to a relatively uninformed electorate aided by media which as in Nazi Germany merely act as cheerleader to the popular will and lead by people whose main aim seems to be at best their party not all people and at worst cliques like the cabals we see presently and in history; spin for their barrow.
How to change it. Time. Village to town to country to state represents a widening of command and control structures perhaps on the whole with beneficial intent for humans as a group. The next leap it seems to me is halted by lack of, not civics but world view of man’s place rights and obligations. We are still at the adolescent stage of comparing our various attributes with hubris against all others; our needs ignoring others.
Can’t change Human Nature? But basic selfish fearful of strangers people of the hermit became those of the tribe of the people and there has stuck. Behaviour has changed at least by self interest. I do not drive on the right of the road I am generally polite and law abiding I do try to analyse the hyped pressures of nationalism fear selfishness and so on as do most nationals here. I have learnt such is in my interests it may also satisfy some inner satisfaction.

What might drive such behaviour. Need, self interest.
Man a plague species seems to have reached such numbers as to exceed the ability of earth to provide. Technology has allowed us to this point and may take us further but it is in my view can only do so for a time before a crash. This is basic biology and physics not political gaming. Left or right, Islamic or Christian
It will be to our individual and collective advantage to co operate, to rid ourselves for the flamboyant self intent figures that grace our history books and the present.
The alternative and probably the one we will follow is to embroil ourselves in wars for water, energy, food and other resources, as indeed we already do, but at a more destructive and wider level of activity.
Naturally we will brand any dissenters as terrorist or unbelievers, the relatively safe and comfortable leaders praising their followers, crocodile tears at funerals at which some almighty will be praised for goodness and brown nosed to relieve us of the mess we have made.

"Unfortunately, as far as peace and security are concerned, the veto has served only served the interest of the superpowers since the UN’s creation"

So true. I think the simplest, most effective measure would be to remove veto power altogether

I think it is time to staff the UN with people who have a committment and the self-interest to see the organisation run effectively.

That is, rather than nameless faceless ambassadors interested only in doing the bidding of their respective governments, we need directly elected representatives interested in, and personally responsible for fixing the problems facing the United Nations.

If we elect a bunch of bums who turn out to be failures, then we can elect someone else. If some country doesn't want to elect their representative, fine, but they don't get a say in any decisions made by the UN.

It's time we have some real democracy, not some fake security council "reform" to keep the powerful happy rubbish. Get rid of the security council and have elected representatives. That way, when things go wrong, we know exactly who to blame and how to get rid of them.