Spamature
President
Obvious target how ?Such a simple answer, I can't believe you are unable to figure it out for yourself.
However, since it seems to have you stumped:
Mailboxes contain letter, periodicals, bills, flyers, even small packages, all sorts of stuff.
A voting drop box contains, generally speaking, only one item: votes.
Making it an obvious target for any person intent on defrauding the vote.
Now it is possible you believe that such people simply don't exist. Or it is possible you believe the system is perfect and cannot possibly be corrupted by any means.
I personally do not believe either of those things. There are people who sometimes do the wrong thing, and no system is perfect.
Which is why I favor taking any reasonable step towards making elections more secure. It won't be perfect, but it will be better.
This is a reasonable step.
What are they going to do with them ?