Why? A few thousand ladybugs is like a few thousand flies, there are so many ladybugs already that they wouldn't make a dent. In areas without pesticides you often see hundreds of them sitting and eating the parasites on some bush.
Because alien species mate and reproduce, growing exponentially. Hidding a bomb in a building is a much milder menace that causes a damage once.
This would be like using a bomb able to make and disseminate more bombs, each one able to make and disseminate more bombs before exploding. And the iteration runs forever basically.
But is there any reason to think they released foreign ladybugs? Importing live insects isn't that easy because they could cause problems, much easier to just get domestic ones. Domestic ladybugs exists everywhere.
I don't know, maybe in your country this correct, but the video spread out across whole world. even in same country, it is probably that there are different species in different regions. the only way can escape this is maybe ladybugs will die soon in urban/city, but is this a good behaviour we hope kids learning? bringing so many creatures and let them died for fun are bad.
And the species of ladybug released is .....? Can you identify and name it?
One problem is that it could happen, and if it goes trendy It will happen.
Even if this is a hoax, is encouraging a massive audience of children to do the same. For tiktokers there is not difference. After all, If is a ladybug is a fire class pokemon predator of pests. Right?
False.
Other is that could provide logistic support to people trying to spread it purposely.
Another is the message:
1) Environmental laws are something that we shouldn't obey, because we know better than adults... and ice cream, and sparkling unicorns
2) Releasing thousands of cute animals in nature is fine.
Even if you are clueless about the risks or can't even identify the animal that you are releasing among the 6000 species of ladybugs.
They may not be aware that some ladybug relatives are herbivorous and eat crops (Surprise!). And if you found a zillion of ladybugs in a local area ready to be packed and sent by mail to your cousin, they most probably will fall in this category.
They may not be aware that some alien ladybugs are in turn predators of native ladybugs
Some even may don't care at all as long as use this virtue signaling videos to win popularity and became the bee-queen in their group of friends
Then, I hope you don't mind if I release this tsetse flies in your dormitory, they are just like the other domestic flies. Unless you are a trained entomologist, you wouldn't even notice that they are there.