I like to trim down the setup logs so they don't get unreasonably big
That means editing - not deleting.**
There really is no strong reason for the logs folder to be protected at all that I can see.
Logs should not, these days, be in the Program Files at all - that is what Application Data was created for and, lest we forget, avast is just an application - albeit a very valuable one.
If some of these issues can be overcome then I agree with Tech - it would be better for users not to have to think about whether the self defense (why did they choose a word spelled differently in US English and everybody else's English) is on.
** As tech reminded me in an earlier thread avast does give a log limit size in the log viewer to ensure that logs do not become too large. But it is a one size fits all and is not ideal for those of us who do testing and sometimes need to create large email logs, debug level logs etc.