The reason I'm worried about security is twofold
What you actually worry is your privacy. If you are somehow found to use bitcoin, you may get robbed and thus, be unsecured. But, you should be aware of how to protect your privacy so that you'll remain secure.
first, Argentinian hackers are said to be among the best (not surprisingly, considering Argentinians generally have penchant for doing damage)
This sounds a bit stereotypical.
The law here is so twisted that if you defend yourself, you go to prison.
So what you want is to never happen to be in a case where you have to defend yourself. The above recommendations are fine to hide your identity. It depends, though, on how you'll buy and use those cryptocurrencies. For instance, if you use a bank to make the transaction, then your state
can know it. Your options are generally limited. Retaining privacy in 2021 is a headache.