1. They are not, really, secret ballots, if other members of the family, or associates, have a look at your ballot. You can claim anything, then go into an actual voting booth, and express your real views. However, mail-ins are subject to overview by dominant personalities. This is not some fantasy on my part...it is happening a lot, according to the stories I have heard. Why take a chance?
2. Things can change, near the end of the election cycle. If you already sent in your ballot, too late to change your mind.
The only safe and authenic ballot cast is the one done in a voting precinct, in a booth, on voting day, without anybody looking over your shoulder.
We are quickly heading down a very dangerous path, with absentee ballots. We should be trying to tighten up, and protect, the vote, not open it up to corruption. If people are too lazy to go the polls, then they are too lazy to be counted. For those who are handicapped, and cannot make it to a polling place, we should be bringing polling places to them (e.g. retirement homes). There should be a compelling, and reviewable, reason to issue an absentee balllot...and it should be a hard ballot to receive.