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Can't see how that follows at all. It's perfectly plausible that they're not made of cells but still have to breath oxygen, for instance, which would make destroying the ecosystem contra-indicated. After all, they decided to invade Earth instead of just colonizing Mars so they must need...

The issue with biological warfare is that both we and the aliens are going to have to basically rediscover the entire field of biology from first principles before we can even comprehend each other. Their brains are going to have to operate on some system entirely different from ours, you...

See, that is the mistaken assumption right there. They don't have time. We can reach space but since it doesn't pay very well, we don't use that ability much. Remember the previous space race? That was purely for bragging rights. But if we know hostile aliens are in space and killing them...

The real fun's going to start when the first aliens show up waving a white postage stamp wanting to become expatriates and join with humanity, in exchange for a nice safe habitrail free of rats, ants, and tarantulas. Not only do said aliens have tremendous amounts of scientific knowledge to...

Those won't wipe out a city. We've seen what meteoroids that size do. https://en.wikipedia.org/wiki/2008_TC3 They vaporize 40 kilometers above the surface and a handful of tiny fragments get found and collected by scientists later.

Building a bioweapon presumes the aliens can retain enough technology to pull it off. Any ship bigger than a breadbox is probably ortillery'd to death. The survivors are going to be shattered wrecks hiding in holes they've dug and desperately hoping no ants, snakes, shrews, cats, or a myriad...

Interestingly there was a show in the late 60s with this premise, though reversed. Land of the Giants was a sci-fi show about a transport that got warped to a planet where everything else was vastly larger and the tiny humans were constantly scavenging and sneaking through the Giant's world to...

Imagine how horrifying rabbits would be. Rabbits would be the equivalent in scale to Brachiosaurus except they're brachiosaurus that can burrow, are remarkably skilled at sneaking and stealing, and have a completely BS reproductive system that bypasses normal ovulation limits to be fertile 24/7...

Yeah, the issue isn't if the A-10 can kill a starship, if it's the A-10 can do it without hitting a 7-11, two houses, and a schoolbus in the process.

It seems like I remember a series of skits with this premise years ago on America's Funniest Home Videos, claymation bits of an alien an inch tall trying to conquer earth and constantly getting squashed or otherwise humiliated due to being so small. Well I'm presuming their blasters are less...