Gun licensing is out of control

Just wait until it's your petunias that get eaten.
You won't be such a lefty snowflake then.

^{from the needless duplicate thread}
But as pointed out above, the culling doesn't have to be by any Tom, Dick and Harry

It's against the law to use a shotgun to kill deer. 
Firearm certificates to use high powered rifles are what we are short of.
I'm not aware of any such contraceptive methods being used but if they are and can be targeted at specific species then great. If not we are only left with hunting.

The trouble with bait is that you can't easily control what eats it.
You might end up harming something else.
Venison is a delicious problem to have though, you just need enough hunters to control the population.
A big problem with both muntjac and water deer is that they are not herd animals like other deer. You rarely see more than one unless it's a mother and fawn.
This makes them hard to shoot in big numbers.

Yep I've heard gun licensing is not been dealt with properly for many years due to overstretched police resources in the UK, posted about this over on UK Debate a few years back IIRC

Sad story and RIP for all victims

It's true that farmers need guns and I think Estonian and Swiss gun laws are reasonable, but the police must do their job checking people meet the requirements and that's not happening

That sadly happens here in the USA way too often too, the Uvalde, Texas shooter IIRC passed background checks where he should have failed them; the existing laws are mostly sufficient here in the USA but they just are never enforced properly when it matters

It destroyed the narrative about the good guy with a gun.

Same with the Vegas shooting at the country music festival. 
The police stood cowering in the stairwell of the hotel while he carried on shooting people.