I think you've made an unnecessary mountain of a molehill with this moan grahame.

I just shake my head at the disruption these people are causing to people's lives. If they think for a minute they are furthering their cause by causing all this disruption they are very much mistaken.

A tall vertical ventilating pipe or tower is almost essential for a composting toilet for several reasons.

1) A steady supply of fresh air assists the composting.
2) Excess moisture evaporates
3) Foul air is removed to above head height.
4) Flies are killed. The waste tends to attract flies, these pests tend to go up the vent pipe attracted by the daylight at the top. Fine mesh covering the top of the vent prevents escape of the flies, which then die and fall into the waste.
For this to work, the interior of the toilet should be dark in order that the flies go towards the daylight at the top of the vent pipe.
The vent pipe should be black externally in order that daylight may slightly warm it and thereby encourage an UPWARD draught.

I just shake my head at the disruption these people are causing to people's lives. If they think for a minute they are furthering their cause by causing all this disruption they are very much mistaken. The police have taken a light touch approach so far much to mine and many others annoyance, but blocking the M32 crossed the line and the police finally took action:
https://www.avonandsomerset.police.uk/news/2019/07/arrests-made-following-protest-activity-affecting-m32-in-bristol/

The police have been taking their PC Brigade patter saying that they have to balance the right to protest against taking action as it may infringe their human rights.   They have a right to protest, agreed, but they are committing an offence by blocking roads which prevents the human rights of people to get about their daily lives.

PMQs dominated by environmental questions today.  Would that have been the case if these demonstrations weren’t taking place?