Almost all bugs seen in Dave's house are immediately executed. I don't have any guilt ending such lifeform existences, and expect neither did our ancient human ancestors. Few enter my abode as I occasionally only see silverfish, houseflies, and spiders. Occasionally a moth may enter, I'll catch and remove those.
That noted, as someone that often hikes in outdoor natural areas, if looking down on trails I avoid stepping on ants and other bugs. Otherwise, just walking through landscapes, if not looking down, as an earth ape creature, I undoubtedly crush many and have no guilt doing so. Last week while backpacking, I squashed plenty of mosquitoes and also some aggressive houseflies that annoyed us any time we were eating.
Likewise, when I brush my teeth, it doesn't bother me that billions of bacteria are destroyed. The first day of six, fishing, I caught, dispatched, cleaned, pan fried, and ate 5 eastern brook trout. I dislike killing fish, but as long as I occasionally consume fish, poultry, and other advanced animal flesh bought at supermarkets, it gives me more respect for doing so by occasionally having to do so myself.
Most Western modern era humans eat far more animals than I do, and without any thoughts of remorse as it is all out of sight, out of mind. I would bet if they had to kill even a few of those animals, that there would be many more vegetarians.