Please elaborate what you mean by "hack attempt"... and other checks, you could do that check after converting the host file to a compatible format.
You can do a hack attempt, and other checks, and that may be cool on your own private system, but I'm pretty sure most people would rather have the option whether or not they want to take that risk, and protect themselves against hackers with a more diverse set of hosts. A prior warning and option would suffice.
I have seven lists that I update manually adding the loopback, which I have custom added to my own git, most of the lists are updated daily, but not mine, its not an automated system... it has dramatically increased my hit list in blocklist log, privacy, and security. I am currently only able to use about 1/3 or so of the lists I would like to... there is just too many to update manually.