If a malware is unknown, no antivirus can respond to this attack.
False, hence why behavioural analysis of files exist. The concept of signature-based antivirus alone is antique.
Antivirus only works when the malware is a common malware. The antivirus is useless when it doesn't know how the attack is done.
Again, not entirely true. An antivirus can be triggered when it identifies at least one attack chain of them all. It may not identify the obfuscation technique, or the process injection, but something as simple as a constant call home can trigger a firewall rule and expose the whole attack.
Sandbox in antivirus don't work the way you think, because cybercriminals can be aware of some flaws the sandbox has.
Ridiculous argument. Every software can have vulnerabilities. Also, this means a malware file must be packed with code to bypass every single antivirus' containment module, given the strange fact that the cybercriminal has identified a way to bypass them all. This is no evidence whatsover to say sandboxes don't work.
Antivirus open the possibility for more vulnerabilities, that wouldn't exist if there was no antivirus.
True, but ALL software open possibilities for vulnerabilities and backdoors. At least antivirus can help you protect you from exploitation of OS vulnerabilities.
Nothing stops an antivirus from scanning your input for keystrokes and scanning your personal photos, then uploading them to their servers.
Lol
Antivirus can report back to national agencies with your information.
No need, you already use Windows or MacOs.
The way you execute a malicious file is by clicking it.
Okay, maybe I'm in hater mode with this one, but this is not true. Malware can be triggered without double clicking it, for example by extracting it.
If I get a link or attachment in an email from supossedly FedEx, DHL or my bank, I go directly to the original website and check it there.
Excellent safety habit, but you can't expect Average Joes to acknowledge this, hence why antiviurus are important to them.
Fileless malware cannot be detected by antivirus.
False. Despite being harder to monitor since there's no file, behavioral approach is usually effective for this type of malware, since file or not, malware usually behaves the same way.