In order to "stop people", you would need to close the borders which would be disastrous policy. Even the Republicans wouldn't be so stupid. As previously stated, the majority of contraband enters the country not by people sneaking across the border, but by people entering legally at ports of entry. A fence isn't going to help you with that. What would help, is improving the technology available at ports of entry to be better able to detect hidden contraband.
Except, Australia has successfully stopped drug, weapon, people trafficking for the most part... Now the main ways to traffick drugs into our nation is via boats and planes through legal means, which we screen rather heavily thanks to border force.
Prior to that we had 51,000 people illegally come to our shores during the previous government term, they brought with them guns, drugs, disease, pests and other issues with them.
Thousands died at sea trying to get here... And I do Marine Rescue. - So I am directly involved in assisting these individuals when they fall into our response area... And I can assure you, their safety was at risk. It's not just our safety. It's everyone's.
That doesn't mean we don't want those people here... Far from it. We want them to follow our rules and regulations so we can screen-out extremism and criminals... And we have a framework for that.
Secure borders absolutely works.
Come on, you are in the middle of the ocean. Lets not act as if you have the same issue any other nation has. 51K is a drop in the bucket for the amount of traffic that come in and out of the US within one day, hell, I would say in 2 hours. Also, from what I have read, Australia has a huge drug problem based on population. As stated, Australia is not the US and trying to make it seem as if they are the same is an overstatement of the size in population between the two and the amount of traffic of populated cities within the 2 nations. Its not apples to apples.