[gnfargbl]

You have that exactly backwards: if someone is hitting you with a password bruteforce from a single IP address (which is the only threat that fail2ban mitigates) then it is assuredly nothing personal at all.

A personal insult, if you are ever unfortunate enough to receive one, will be much more stealthy and neither fail2ban nor any other magical rock will protect you against it.

[CapitalistCartr]

You don't see any tigers around, do you?

[gog]

Usually they use a big pool of IP addresses, but that doesn't make fail2ban completely useless since they do reuse IPs.