The real reason this shouldn't be allowed is because the internet is absolutely not secure enough for citizens from one country to start attacking other countries. You think it's funny to wipe a Russians hard drive with a heart but I garuntee what they do back out of spite won't be. The very epitome of throwing rocks from glass houses.
I'm not even sure if we have to consider retribution why this is a bad idea. There is no control over the blast radius this has. It could hit anything, from a military or criminal system (possibly doing something you could consider good) down to any kind of hospital, humanitarian organization, an org collecting data against putin. In any kind of conventional weapon used by a western state, such a lack of control would be a huge no-go.